diff --git a/src/Helper/LabelCallback.php b/src/Helper/LabelCallback.php
index 04be405..db6d5c1 100644
--- a/src/Helper/LabelCallback.php
+++ b/src/Helper/LabelCallback.php
@@ -53,9 +53,11 @@ public static function createAndRegister(string $table, callable $callback): sel
     }
 
     /**
+     * @param callable|array $callback
+     *
      * @return mixed
      */
-    private function executeCallback(callable $callback, array $args)
+    private function executeCallback($callback, array $args)
     {
         // Support Contao's getInstance() method when callback is an array
         if (\is_array($callback)) {