1 files changed, 6 insertions, 6 deletions
diff --git a/src/string.c b/src/string.c
index 6664eabd6..0d31a304f 100644
--- a/src/string.c
+++ b/src/string.c
@@ -352,12 +352,12 @@ mrb_memsearch(const void *x0, mrb_int m, const void *y0, mrb_int n)
     return 0;
   }
   else if (m == 1) {
-    const unsigned char *ys = y, *ye = ys + n;
-    for (; y < ye; ++y) {
-      if (*x == *y)
-        return y - ys;
-    }
-    return -1;
+    const unsigned char *ys = memchr(y, *x, n);
+
+    if (ys)
+      return ys - y;
+    else
+      return -1;
   }
   return mrb_memsearch_qs((const unsigned char *)x0, m, (const unsigned char *)y0, n);
 }