1 files changed, 1 insertions, 1 deletions
diff --git a/re.c b/re.c
index e487e55869..b0b53c1de4 100644
--- a/re.c
+++ b/re.c
@@ -95,7 +95,7 @@ rb_memsearch_ss(const unsigned char *xs, long m, const unsigned char *ys, long n
 {
     const unsigned char *y;
 
-    if (y = memmem(ys, n, xs, m))
+    if ((y = memmem(ys, n, xs, m)) != NULL)
 	return y - ys;
     else
 	return -1;