diff --git a/contrib/gcclibs/libiberty/regex.c b/contrib/gcclibs/libiberty/regex.c
index fa1df197ce9d..c24026e9e461 100644
--- a/contrib/gcclibs/libiberty/regex.c
+++ b/contrib/gcclibs/libiberty/regex.c
@@ -149,7 +149,7 @@ char *realloc ();
 #    include <string.h>
 #    ifndef bzero
 #     ifndef _LIBC
-#      define bzero(s, n)	(memset (s, '\0', n), (s))
+#      define bzero(s, n)	((void) (memset (s, '\0', n), (s)))
 #     else
 #      define bzero(s, n)	__bzero (s, n)
 #     endif