diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index a02992f6171..cb3c0121ad6 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -5,14 +5,6 @@
 #define _SGI_MP_SOURCE
 #endif
 
-/* Convert a possibly signed character to a nonnegative int */
-/* XXX This assumes characters are 8 bits wide */
-#ifdef __CHAR_UNSIGNED__
-#define Py_CHARMASK(c)		(c)
-#else
-#define Py_CHARMASK(c)		((c) & 0xff)
-#endif
-
 /* strtol and strtoul, renamed to avoid conflicts */