diff --git a/src/Symfony/Component/DependencyInjection/InterfaceInjector.php b/src/Symfony/Component/DependencyInjection/InterfaceInjector.php
index d17e9680ca4d..c40308427995 100755
--- a/src/Symfony/Component/DependencyInjection/InterfaceInjector.php
+++ b/src/Symfony/Component/DependencyInjection/InterfaceInjector.php
@@ -76,9 +76,7 @@ public function processDefinition(Definition $definition, $class = null)
 
         foreach ($this->calls as $callback) {
             list($method, $arguments) = $callback;
-            if (!$definition->hasMethodCall($method)) {
-                $definition->addMethodCall($method, $arguments);
-            }
+            $definition->addMethodCall($method, $arguments);
         }
 
         $this->processedDefinitions[] = $definition;