diff --git a/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php b/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php
index 370af81c322d9..36449d8d3042a 100644
--- a/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php
+++ b/src/Symfony/Component/DependencyInjection/Config/AutowireServiceResource.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Config;
 
 use Symfony\Component\Config\Resource\SelfCheckingResourceInterface;
+use Symfony\Component\DependencyInjection\Compiler\AutowirePass;
 
 class AutowireServiceResource implements SelfCheckingResourceInterface, \Serializable
 {
@@ -32,7 +33,19 @@ public function isFresh($timestamp)
             return false;
         }
 
-        return @filemtime($this->filePath) <= $timestamp;
+        // has the file *not* been modified? Definitely fresh
+        if (@filemtime($this->filePath) <= $timestamp) {
+            return true;
+        }
+
+        try {
+            $reflectionClass = new \ReflectionClass($this->class);
+        } catch (\ReflectionException $e) {
+            // the class does not exist anymore!
+            return false;
+        }
+
+        return (array) $this === (array) AutowirePass::createResourceForClass($reflectionClass);
     }
 
     public function __toString()