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-rw-r--r--include/ctype.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/ctype.h b/include/ctype.h
index 96ca2b61b..c6faf3d9b 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -72,8 +72,8 @@ extern int isxupper(int c) __THROW; /* uClibc-specific. */
#define __isascii(c) (((c) & ~0x7f) == 0)
#define __toascii(c) ((c) & 0x7f)
-#define _tolower(c) (isupper(c) ? tolower(c) : (c))
-#define _toupper(c) (islower(c) ? toupper(c) : (c))
+#define _toupper(c) ((c) ^ 0x20)
+#define _tolower(c) ((c) | 0x20)
/* For compatibility with older versions of uClibc. Are these ever used? */