diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index f076fae..74cb033 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -137,6 +137,8 @@
 #define Py_UNICODE_TODIGIT(ch) _PyUnicode_ToDigit(ch)
 #define Py_UNICODE_TONUMERIC(ch) _PyUnicode_ToNumeric(ch)
 
+#define Py_UNICODE_ISALPHA(ch) iswalpha(ch)
+
 #else
 
 #define Py_UNICODE_ISSPACE(ch) _PyUnicode_IsWhitespace(ch)
@@ -158,12 +160,9 @@
 #define Py_UNICODE_TODIGIT(ch) _PyUnicode_ToDigit(ch)
 #define Py_UNICODE_TONUMERIC(ch) _PyUnicode_ToNumeric(ch)
 
-#endif
+#define Py_UNICODE_ISALPHA(ch) _PyUnicode_IsAlpha(ch)
 
-#define Py_UNICODE_ISALPHA(ch) \
-       (Py_UNICODE_ISLOWER(ch) || \
-        Py_UNICODE_ISUPPER(ch) || \
-        Py_UNICODE_ISTITLE(ch))
+#endif
 
 #define Py_UNICODE_ISALNUM(ch) \
        (Py_UNICODE_ISALPHA(ch) || \
@@ -871,6 +870,10 @@
     register const Py_UNICODE ch 	/* Unicode character */
     );
 
+extern DL_IMPORT(int) _PyUnicode_IsAlpha(
+    register const Py_UNICODE ch 	/* Unicode character */
+    );
+
 #ifdef __cplusplus
 }
 #endif