diff --git a/Python/dynload_aix.c b/Python/dynload_aix.c
index b3ff8e2..684f10a 100644
--- a/Python/dynload_aix.c
+++ b/Python/dynload_aix.c
@@ -140,7 +140,7 @@
             if (nerr == load_errtab[j].errNo && load_errtab[j].errstr)
             ERRBUF_APPEND(load_errtab[j].errstr);
         }
-        while (Py_ISDIGIT(Py_CHARMASK(*message[i]))) message[i]++ ;
+        while (Py_ISDIGIT(*message[i])) message[i]++ ;
         ERRBUF_APPEND(message[i]);
         ERRBUF_APPEND("\n");
     }
diff --git a/Python/getargs.c b/Python/getargs.c
index 02a0366..7723ae3 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -312,7 +312,7 @@
             break;
         default:
             if (level == 0) {
-                if (Py_ISALPHA(Py_CHARMASK(c)))
+                if (Py_ISALPHA(c))
                     if (c != 'e') /* skip encoded */
                         max++;
             }
@@ -397,7 +397,7 @@
         }
     }
 
-    if (*format != '\0' && !Py_ISALPHA(Py_CHARMASK(*format)) &&
+    if (*format != '\0' && !Py_ISALPHA(*format) &&
         *format != '(' &&
         *format != '|' && *format != ':' && *format != ';') {
         PyErr_Format(PyExc_SystemError,
@@ -521,7 +521,7 @@
         }
         else if (c == ':' || c == ';' || c == '\0')
             break;
-        else if (level == 0 && Py_ISALPHA(Py_CHARMASK(c)))
+        else if (level == 0 && Py_ISALPHA(c))
             n++;
     }
 
diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index 7ab5814..19fa57a 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -99,7 +99,7 @@
     int ovlimit;       /* required digits to overflow */
 
     /* skip leading white space */
-    while (*str && Py_ISSPACE(Py_CHARMASK(*str)))
+    while (*str && Py_ISSPACE(*str))
         ++str;
 
     /* check for leading 0b, 0o or 0x for auto-base or base 16 */
@@ -138,7 +138,7 @@
                 /* skip all zeroes... */
                 while (*str == '0')
                     ++str;
-                while (Py_ISSPACE(Py_CHARMASK(*str)))
+                while (Py_ISSPACE(*str))
                     ++str;
                 if (ptr)
                     *ptr = (char *)str;
@@ -266,7 +266,7 @@
     unsigned long uresult;
     char sign;
 
-    while (*str && Py_ISSPACE(Py_CHARMASK(*str)))
+    while (*str && Py_ISSPACE(*str))
         str++;
 
     sign = *str;