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-rw-r--r--string/strcasestr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/string/strcasestr.c b/string/strcasestr.c
index 184ca68deb..b6458aef52 100644
--- a/string/strcasestr.c
+++ b/string/strcasestr.c
@@ -36,7 +36,7 @@
 #include <stdbool.h>
 #include <strings.h>
 
-#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
+#define TOLOWER(Ch) tolower (Ch)
 
 /* Two-Way algorithm.  */
 #define RETURN_TYPE char *