diff --git a/src/Illuminate/Validation/Validator.php b/src/Illuminate/Validation/Validator.php
index ad609f677b90..05b2d3ca43e7 100755
--- a/src/Illuminate/Validation/Validator.php
+++ b/src/Illuminate/Validation/Validator.php
@@ -3352,7 +3352,11 @@ protected function callReplacer($message, $attribute, $rule, $parameters)
      */
     protected function callClassBasedReplacer($callback, $message, $attribute, $rule, $parameters)
     {
-        list($class, $method) = explode('@', $callback);
+        if (Str::contains($callback, '@')) {
+            list($class, $method) = explode('@', $callback);
+        } else {
+            list($class, $method) = [$callback, 'replace'];
+        }
 
         return call_user_func_array([$this->container->make($class), $method], array_slice(func_get_args(), 1));
     }