diff --git a/src/Illuminate/Routing/UrlGenerator.php b/src/Illuminate/Routing/UrlGenerator.php
index 49b8c78a89a0..9f933fc67d51 100755
--- a/src/Illuminate/Routing/UrlGenerator.php
+++ b/src/Illuminate/Routing/UrlGenerator.php
@@ -349,7 +349,7 @@ public function hasValidSignature(Request $request)
 
         $signature = hash_hmac('sha256', $original, call_user_func($this->keyResolver));
 
-        return  hash_equals($signature, $request->query('signature', '')) &&
+        return  hash_equals($signature, (string) $request->query('signature', '')) &&
                ! ($expires && Carbon::now()->getTimestamp() > $expires);
     }