diff --git a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
index 02ffd902254e0..1910ec66a25c6 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
@@ -108,7 +108,8 @@ private function findClasses($namespace, $pattern)
             if (!$r = $this->container->getReflectionClass($class)) {
                 throw new InvalidArgumentException(sprintf('Expected to find class "%s" in file "%s" while importing services from resource "%s", but it was not found! Check the namespace prefix used with the resource.', $class, $path, $pattern));
             }
-            if (!$r->isInterface() && !$r->isTrait()) {
+
+            if (!$r->isInterface() && !$r->isTrait() && !$r->isAbstract()) {
                 $classes[] = $class;
             }
         }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadAbstractBar.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadAbstractBar.php
new file mode 100644
index 0000000000000..0b72234aae7a6
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadAbstractBar.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Sub;
+
+abstract class NoLoadAbstractBar
+{
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadBarInterface.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadBarInterface.php
new file mode 100644
index 0000000000000..dffb05352b3c0
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadBarInterface.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Sub;
+
+interface NoLoadBarInterface
+{
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadBarTrait.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadBarTrait.php
new file mode 100644
index 0000000000000..5a961ee7684c3
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/Sub/NoLoadBarTrait.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Sub;
+
+trait NoLoadBarTrait
+{
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
index e4731d6d2bb6e..b0245c3556388 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
@@ -84,7 +84,10 @@ public function testRegisterClasses()
 
         $loader->registerClasses(new Definition(), 'Symfony\Component\DependencyInjection\Tests\Fixtures\Prototype\Sub\\', 'Prototype/%sub_dir%/*');
 
-        $this->assertTrue($container->has(Bar::class));
+        $this->assertEquals(
+            array('service_container', Bar::class),
+            array_keys($container->getDefinitions())
+        );
     }
 
     /**