diff --git a/Grid/Source/Source.php b/Grid/Source/Source.php
index e5f9ce32..c96bb734 100755
--- a/Grid/Source/Source.php
+++ b/Grid/Source/Source.php
@@ -50,9 +50,10 @@ public function prepareRow($row)
     }
 
     /**
-     * @param \Closure $callback
+     * @param callable $callback
+     * @return $this
      */
-    public function manipulateQuery(\Closure $callback = null)
+    public function manipulateQuery(callable $callback = null)
     {
         $this->prepareQueryCallback = $callback;