diff --git a/src/Symfony/Contracts/Service/ServiceLocatorTrait.php b/src/Symfony/Contracts/Service/ServiceLocatorTrait.php
index 4ec6eb4276cf1..085f9bf1358e6 100644
--- a/src/Symfony/Contracts/Service/ServiceLocatorTrait.php
+++ b/src/Symfony/Contracts/Service/ServiceLocatorTrait.php
@@ -63,6 +63,10 @@ public function get($id)
 
         $this->loading[$id] = $id;
         try {
+            if (!\is_callable($this->factories[$id])) {
+                return $this->factories[$id];
+            }
+
             return $this->factories[$id]($this);
         } finally {
             unset($this->loading[$id]);