diff --git a/src/Symfony/Component/DependencyInjection/Container.php b/src/Symfony/Component/DependencyInjection/Container.php
index 443a65fb41..fb0e31911b 100644
--- a/src/Symfony/Component/DependencyInjection/Container.php
+++ b/src/Symfony/Component/DependencyInjection/Container.php
@@ -312,10 +312,7 @@ class Container implements IntrospectableContainerInterface
                 $service = $this->$method();
             } catch (\Exception $e) {
                 unset($this->loading[$id]);
-
-                if (array_key_exists($id, $this->services)) {
-                    unset($this->services[$id]);
-                }
+                unset($this->services[$id]);
 
                 if ($e instanceof InactiveScopeException && self::EXCEPTION_ON_INVALID_REFERENCE !== $invalidBehavior) {
                     return;
diff --git a/src/Symfony/Component/DependencyInjection/Definition.php b/src/Symfony/Component/DependencyInjection/Definition.php
index e2b40ff4b9..690daa9c6a 100644
--- a/src/Symfony/Component/DependencyInjection/Definition.php
+++ b/src/Symfony/Component/DependencyInjection/Definition.php
@@ -409,9 +409,7 @@ class Definition
      */
     public function clearTag($name)
     {
-        if (isset($this->tags[$name])) {
-            unset($this->tags[$name]);
-        }
+        unset($this->tags[$name]);
 
         return $this;
     }