diff --git a/lib/string.c b/lib/string.c
index 0f86245..f71bead 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -689,13 +689,13 @@
  */
 char *strnstr(const char *s1, const char *s2, size_t len)
 {
-	size_t l1 = len, l2;
+	size_t l2;
 
 	l2 = strlen(s2);
 	if (!l2)
 		return (char *)s1;
-	while (l1 >= l2) {
-		l1--;
+	while (len >= l2) {
+		len--;
 		if (!memcmp(s1, s2, l2))
 			return (char *)s1;
 		s1++;