diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index ff84495..5591847 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -2244,16 +2244,16 @@
 
     for (i = j = 0; i < len; ) {
         /* find a token */
-        while (i < len && ISSPACE(s[i]))
+        while (i < len && Py_ISSPACE(s[i]))
             i++;
         j = i;
-        while (i < len && !ISSPACE(s[i]))
+        while (i < len && !Py_ISSPACE(s[i]))
             i++;
         if (j < i) {
             if (maxcount-- <= 0)
                 break;
             SPLIT_ADD(s, j, i);
-            while (i < len && ISSPACE(s[i]))
+            while (i < len && Py_ISSPACE(s[i]))
                 i++;
             j = i;
         }
@@ -2478,16 +2478,16 @@
 
     for (i = j = len - 1; i >= 0; ) {
         /* find a token */
-        while (i >= 0 && ISSPACE(s[i]))
+        while (i >= 0 && Py_ISSPACE(s[i]))
             i--;
         j = i;
-        while (i >= 0 && !ISSPACE(s[i]))
+        while (i >= 0 && !Py_ISSPACE(s[i]))
             i--;
         if (j > i) {
             if (maxcount-- <= 0)
                 break;
             SPLIT_ADD(s, i + 1, j + 1);
-            while (i >= 0 && ISSPACE(s[i]))
+            while (i >= 0 && Py_ISSPACE(s[i]))
                 i--;
             j = i;
         }
@@ -3054,11 +3054,11 @@
 static int
 hex_digit_to_int(char c)
 {
-    if (ISDIGIT(c))
+    if (Py_ISDIGIT(c))
         return c - '0';
     else {
-        if (ISUPPER(c))
-            c = TOLOWER(c);
+        if (Py_ISUPPER(c))
+            c = Py_TOLOWER(c);
         if (c >= 'a' && c <= 'f')
             return c - 'a' + 10;
     }
diff --git a/Objects/bytes_methods.c b/Objects/bytes_methods.c
index de87905..4d25520 100644
--- a/Objects/bytes_methods.c
+++ b/Objects/bytes_methods.c
@@ -1,219 +1,6 @@
 #include "Python.h"
 #include "bytes_methods.h"
 
-/* Our own locale-independent ctype.h-like macros */
-
-const unsigned int _Py_ctype_table[256] = {
-    0, /* 0x0 '\x00' */
-    0, /* 0x1 '\x01' */
-    0, /* 0x2 '\x02' */
-    0, /* 0x3 '\x03' */
-    0, /* 0x4 '\x04' */
-    0, /* 0x5 '\x05' */
-    0, /* 0x6 '\x06' */
-    0, /* 0x7 '\x07' */
-    0, /* 0x8 '\x08' */
-    FLAG_SPACE, /* 0x9 '\t' */
-    FLAG_SPACE, /* 0xa '\n' */
-    FLAG_SPACE, /* 0xb '\v' */
-    FLAG_SPACE, /* 0xc '\f' */
-    FLAG_SPACE, /* 0xd '\r' */
-    0, /* 0xe '\x0e' */
-    0, /* 0xf '\x0f' */
-    0, /* 0x10 '\x10' */
-    0, /* 0x11 '\x11' */
-    0, /* 0x12 '\x12' */
-    0, /* 0x13 '\x13' */
-    0, /* 0x14 '\x14' */
-    0, /* 0x15 '\x15' */
-    0, /* 0x16 '\x16' */
-    0, /* 0x17 '\x17' */
-    0, /* 0x18 '\x18' */
-    0, /* 0x19 '\x19' */
-    0, /* 0x1a '\x1a' */
-    0, /* 0x1b '\x1b' */
-    0, /* 0x1c '\x1c' */
-    0, /* 0x1d '\x1d' */
-    0, /* 0x1e '\x1e' */
-    0, /* 0x1f '\x1f' */
-    FLAG_SPACE, /* 0x20 ' ' */
-    0, /* 0x21 '!' */
-    0, /* 0x22 '"' */
-    0, /* 0x23 '#' */
-    0, /* 0x24 '$' */
-    0, /* 0x25 '%' */
-    0, /* 0x26 '&' */
-    0, /* 0x27 "'" */
-    0, /* 0x28 '(' */
-    0, /* 0x29 ')' */
-    0, /* 0x2a '*' */
-    0, /* 0x2b '+' */
-    0, /* 0x2c ',' */
-    0, /* 0x2d '-' */
-    0, /* 0x2e '.' */
-    0, /* 0x2f '/' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x30 '0' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x31 '1' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x32 '2' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x33 '3' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x34 '4' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x35 '5' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x36 '6' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x37 '7' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x38 '8' */
-    FLAG_DIGIT|FLAG_XDIGIT, /* 0x39 '9' */
-    0, /* 0x3a ':' */
-    0, /* 0x3b ';' */
-    0, /* 0x3c '<' */
-    0, /* 0x3d '=' */
-    0, /* 0x3e '>' */
-    0, /* 0x3f '?' */
-    0, /* 0x40 '@' */
-    FLAG_UPPER|FLAG_XDIGIT, /* 0x41 'A' */
-    FLAG_UPPER|FLAG_XDIGIT, /* 0x42 'B' */
-    FLAG_UPPER|FLAG_XDIGIT, /* 0x43 'C' */
-    FLAG_UPPER|FLAG_XDIGIT, /* 0x44 'D' */
-    FLAG_UPPER|FLAG_XDIGIT, /* 0x45 'E' */
-    FLAG_UPPER|FLAG_XDIGIT, /* 0x46 'F' */
-    FLAG_UPPER, /* 0x47 'G' */
-    FLAG_UPPER, /* 0x48 'H' */
-    FLAG_UPPER, /* 0x49 'I' */
-    FLAG_UPPER, /* 0x4a 'J' */
-    FLAG_UPPER, /* 0x4b 'K' */
-    FLAG_UPPER, /* 0x4c 'L' */
-    FLAG_UPPER, /* 0x4d 'M' */
-    FLAG_UPPER, /* 0x4e 'N' */
-    FLAG_UPPER, /* 0x4f 'O' */
-    FLAG_UPPER, /* 0x50 'P' */
-    FLAG_UPPER, /* 0x51 'Q' */
-    FLAG_UPPER, /* 0x52 'R' */
-    FLAG_UPPER, /* 0x53 'S' */
-    FLAG_UPPER, /* 0x54 'T' */
-    FLAG_UPPER, /* 0x55 'U' */
-    FLAG_UPPER, /* 0x56 'V' */
-    FLAG_UPPER, /* 0x57 'W' */
-    FLAG_UPPER, /* 0x58 'X' */
-    FLAG_UPPER, /* 0x59 'Y' */
-    FLAG_UPPER, /* 0x5a 'Z' */
-    0, /* 0x5b '[' */
-    0, /* 0x5c '\\' */
-    0, /* 0x5d ']' */
-    0, /* 0x5e '^' */
-    0, /* 0x5f '_' */
-    0, /* 0x60 '`' */
-    FLAG_LOWER|FLAG_XDIGIT, /* 0x61 'a' */
-    FLAG_LOWER|FLAG_XDIGIT, /* 0x62 'b' */
-    FLAG_LOWER|FLAG_XDIGIT, /* 0x63 'c' */
-    FLAG_LOWER|FLAG_XDIGIT, /* 0x64 'd' */
-    FLAG_LOWER|FLAG_XDIGIT, /* 0x65 'e' */
-    FLAG_LOWER|FLAG_XDIGIT, /* 0x66 'f' */
-    FLAG_LOWER, /* 0x67 'g' */
-    FLAG_LOWER, /* 0x68 'h' */
-    FLAG_LOWER, /* 0x69 'i' */
-    FLAG_LOWER, /* 0x6a 'j' */
-    FLAG_LOWER, /* 0x6b 'k' */
-    FLAG_LOWER, /* 0x6c 'l' */
-    FLAG_LOWER, /* 0x6d 'm' */
-    FLAG_LOWER, /* 0x6e 'n' */
-    FLAG_LOWER, /* 0x6f 'o' */
-    FLAG_LOWER, /* 0x70 'p' */
-    FLAG_LOWER, /* 0x71 'q' */
-    FLAG_LOWER, /* 0x72 'r' */
-    FLAG_LOWER, /* 0x73 's' */
-    FLAG_LOWER, /* 0x74 't' */
-    FLAG_LOWER, /* 0x75 'u' */
-    FLAG_LOWER, /* 0x76 'v' */
-    FLAG_LOWER, /* 0x77 'w' */
-    FLAG_LOWER, /* 0x78 'x' */
-    FLAG_LOWER, /* 0x79 'y' */
-    FLAG_LOWER, /* 0x7a 'z' */
-    0, /* 0x7b '{' */
-    0, /* 0x7c '|' */
-    0, /* 0x7d '}' */
-    0, /* 0x7e '~' */
-    0, /* 0x7f '\x7f' */
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-};
-
-
-const unsigned char _Py_ctype_tolower[256] = {
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
-    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
-    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
-    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
-    0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
-    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
-    0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
-    0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
-    0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
-    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
-    0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
-    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
-    0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
-    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
-    0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
-    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
-    0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
-    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
-    0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
-    0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
-    0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
-    0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
-    0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
-    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
-    0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
-    0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
-    0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
-    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
-    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
-    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
-    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
-};
-
-const unsigned char _Py_ctype_toupper[256] = {
-    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
-    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
-    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
-    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
-    0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
-    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
-    0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
-    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
-    0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
-    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
-    0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
-    0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
-    0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
-    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
-    0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
-    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
-    0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
-    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
-    0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
-    0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
-    0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
-    0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
-    0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
-    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
-    0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
-    0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
-    0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
-    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
-    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
-    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
-    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
-};
-
-
 PyDoc_STRVAR_shared(_Py_isspace__doc__,
 "B.isspace() -> bool\n\
 \n\
@@ -228,7 +15,7 @@
     register const unsigned char *e;
 
     /* Shortcut for single character strings */
-    if (len == 1 && ISSPACE(*p))
+    if (len == 1 && Py_ISSPACE(*p))
         Py_RETURN_TRUE;
 
     /* Special case for empty strings */
@@ -237,7 +24,7 @@
 
     e = p + len;
     for (; p < e; p++) {
-	if (!ISSPACE(*p))
+	if (!Py_ISSPACE(*p))
             Py_RETURN_FALSE;
     }
     Py_RETURN_TRUE;
@@ -258,7 +45,7 @@
     register const unsigned char *e;
 
     /* Shortcut for single character strings */
-    if (len == 1 && ISALPHA(*p))
+    if (len == 1 && Py_ISALPHA(*p))
 	Py_RETURN_TRUE;
 
     /* Special case for empty strings */
@@ -267,7 +54,7 @@
 
     e = p + len;
     for (; p < e; p++) {
-	if (!ISALPHA(*p))
+	if (!Py_ISALPHA(*p))
 	    Py_RETURN_FALSE;
     }
     Py_RETURN_TRUE;
@@ -288,7 +75,7 @@
     register const unsigned char *e;
 
     /* Shortcut for single character strings */
-    if (len == 1 && ISALNUM(*p))
+    if (len == 1 && Py_ISALNUM(*p))
 	Py_RETURN_TRUE;
 
     /* Special case for empty strings */
@@ -297,7 +84,7 @@
 
     e = p + len;
     for (; p < e; p++) {
-	if (!ISALNUM(*p))
+	if (!Py_ISALNUM(*p))
 	    Py_RETURN_FALSE;
     }
     Py_RETURN_TRUE;
@@ -318,7 +105,7 @@
     register const unsigned char *e;
 
     /* Shortcut for single character strings */
-    if (len == 1 && ISDIGIT(*p))
+    if (len == 1 && Py_ISDIGIT(*p))
 	Py_RETURN_TRUE;
 
     /* Special case for empty strings */
@@ -327,7 +114,7 @@
 
     e = p + len;
     for (; p < e; p++) {
-	if (!ISDIGIT(*p))
+	if (!Py_ISDIGIT(*p))
 	    Py_RETURN_FALSE;
     }
     Py_RETURN_TRUE;
@@ -350,7 +137,7 @@
 
     /* Shortcut for single character strings */
     if (len == 1)
-	return PyBool_FromLong(ISLOWER(*p));
+	return PyBool_FromLong(Py_ISLOWER(*p));
 
     /* Special case for empty strings */
     if (len == 0)
@@ -359,9 +146,9 @@
     e = p + len;
     cased = 0;
     for (; p < e; p++) {
-	if (ISUPPER(*p))
+	if (Py_ISUPPER(*p))
 	    Py_RETURN_FALSE;
-	else if (!cased && ISLOWER(*p))
+	else if (!cased && Py_ISLOWER(*p))
 	    cased = 1;
     }
     return PyBool_FromLong(cased);
@@ -384,7 +171,7 @@
 
     /* Shortcut for single character strings */
     if (len == 1)
-	return PyBool_FromLong(ISUPPER(*p));
+	return PyBool_FromLong(Py_ISUPPER(*p));
 
     /* Special case for empty strings */
     if (len == 0)
@@ -393,9 +180,9 @@
     e = p + len;
     cased = 0;
     for (; p < e; p++) {
-	if (ISLOWER(*p))
+	if (Py_ISLOWER(*p))
 	    Py_RETURN_FALSE;
-	else if (!cased && ISUPPER(*p))
+	else if (!cased && Py_ISUPPER(*p))
 	    cased = 1;
     }
     return PyBool_FromLong(cased);
@@ -420,7 +207,7 @@
 
     /* Shortcut for single character strings */
     if (len == 1)
-	return PyBool_FromLong(ISUPPER(*p));
+	return PyBool_FromLong(Py_ISUPPER(*p));
 
     /* Special case for empty strings */
     if (len == 0)
@@ -432,13 +219,13 @@
     for (; p < e; p++) {
 	register const unsigned char ch = *p;
 
-	if (ISUPPER(ch)) {
+	if (Py_ISUPPER(ch)) {
 	    if (previous_is_cased)
 		Py_RETURN_FALSE;
 	    previous_is_cased = 1;
 	    cased = 1;
 	}
-	else if (ISLOWER(ch)) {
+	else if (Py_ISLOWER(ch)) {
 	    if (!previous_is_cased)
 		Py_RETURN_FALSE;
 	    previous_is_cased = 1;
@@ -473,8 +260,8 @@
 
 	for (i = 0; i < len; i++) {
 		int c = Py_CHARMASK(result[i]);
-		if (ISUPPER(c))
-			result[i] = TOLOWER(c);
+		if (Py_ISUPPER(c))
+			result[i] = Py_TOLOWER(c);
 	}
 }
 
@@ -501,8 +288,8 @@
 
 	for (i = 0; i < len; i++) {
 		int c = Py_CHARMASK(result[i]);
-		if (ISLOWER(c))
-			result[i] = TOUPPER(c);
+		if (Py_ISLOWER(c))
+			result[i] = Py_TOUPPER(c);
 	}
 }
 
@@ -527,13 +314,13 @@
         */
 	for (i = 0; i < len; i++) {
 		int c = Py_CHARMASK(*s++);
-		if (ISLOWER(c)) {
+		if (Py_ISLOWER(c)) {
 			if (!previous_is_cased)
-			    c = TOUPPER(c);
+			    c = Py_TOUPPER(c);
 			previous_is_cased = 1;
-		} else if (ISUPPER(c)) {
+		} else if (Py_ISUPPER(c)) {
 			if (previous_is_cased)
-			    c = TOLOWER(c);
+			    c = Py_TOLOWER(c);
 			previous_is_cased = 1;
 		} else
 			previous_is_cased = 0;
@@ -560,16 +347,16 @@
         */
 	if (0 < len) {
 		int c = Py_CHARMASK(*s++);
-		if (ISLOWER(c))
-			*result = TOUPPER(c);
+		if (Py_ISLOWER(c))
+			*result = Py_TOUPPER(c);
 		else
 			*result = c;
 		result++;
 	}
 	for (i = 1; i < len; i++) {
 		int c = Py_CHARMASK(*s++);
-		if (ISUPPER(c))
-			*result = TOLOWER(c);
+		if (Py_ISUPPER(c))
+			*result = Py_TOLOWER(c);
 		else
 			*result = c;
 		result++;
@@ -596,11 +383,11 @@
         */
 	for (i = 0; i < len; i++) {
 		int c = Py_CHARMASK(*s++);
-		if (ISLOWER(c)) {
-			*result = TOUPPER(c);
+		if (Py_ISLOWER(c)) {
+			*result = Py_TOUPPER(c);
 		}
-		else if (ISUPPER(c)) {
-			*result = TOLOWER(c);
+		else if (Py_ISUPPER(c)) {
+			*result = Py_TOLOWER(c);
 		}
 		else
 			*result = c;
diff --git a/Objects/stringlib/stringdefs.h b/Objects/stringlib/stringdefs.h
index d08971a..f6d0b51 100644
--- a/Objects/stringlib/stringdefs.h
+++ b/Objects/stringlib/stringdefs.h
@@ -6,15 +6,6 @@
    compiled as unicode. */
 #define STRINGLIB_IS_UNICODE     0
 
-/* _tolower and _toupper are defined by SUSv2, but they're not ISO C */
-/* This needs to be cleaned up. See issue 5793. */
-#ifndef _tolower
-#define _tolower tolower
-#endif
-#ifndef _toupper
-#define _toupper toupper
-#endif
-
 #define STRINGLIB_OBJECT         PyStringObject
 #define STRINGLIB_CHAR           char
 #define STRINGLIB_TYPE_NAME      "string"
@@ -22,8 +13,8 @@
 #define STRINGLIB_EMPTY          nullstring
 #define STRINGLIB_ISDECIMAL(x)   ((x >= '0') && (x <= '9'))
 #define STRINGLIB_TODECIMAL(x)   (STRINGLIB_ISDECIMAL(x) ? (x - '0') : -1)
-#define STRINGLIB_TOUPPER(x)     _toupper(Py_CHARMASK(x))
-#define STRINGLIB_TOLOWER(x)     _tolower(Py_CHARMASK(x))
+#define STRINGLIB_TOUPPER        Py_TOUPPER
+#define STRINGLIB_TOLOWER        Py_TOLOWER
 #define STRINGLIB_FILL           memset
 #define STRINGLIB_STR            PyString_AS_STRING
 #define STRINGLIB_LEN            PyString_GET_SIZE