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-rw-r--r--sysdeps/generic/strcasestr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/generic/strcasestr.c b/sysdeps/generic/strcasestr.c
index 6327dfab49..1dde43c606 100644
--- a/sysdeps/generic/strcasestr.c
+++ b/sysdeps/generic/strcasestr.c
@@ -38,7 +38,7 @@
 
 #ifdef _LIBC
 # include <locale/localeinfo.h>
-# define TOLOWER(c) __tolower_l (c, loc)
+# define TOLOWER(c) __tolower_l ((unsigned char) c, loc)
 #else
 # define TOLOWER(c) _tolower (c)
 #endif