diff --git a/lib/Prezent/Doctrine/Translatable/Mapping/Driver/AnnotationDriver.php b/lib/Prezent/Doctrine/Translatable/Mapping/Driver/AnnotationDriver.php
index <HASH>..<HASH> 100644
--- a/lib/Prezent/Doctrine/Translatable/Mapping/Driver/AnnotationDriver.php
+++ b/lib/Prezent/Doctrine/Translatable/Mapping/Driver/AnnotationDriver.php
@@ -53,6 +53,8 @@ class AnnotationDriver implements DriverInterface
         if ($class->implementsInterface('Prezent\\Doctrine\\Translatable\\TranslationInterface')) {
             return $this->loadTranslationMetadata($class);
         }
+
+        return null;
     }
 
     /**
diff --git a/lib/Prezent/Doctrine/Translatable/Mapping/Driver/FileDriver.php b/lib/Prezent/Doctrine/Translatable/Mapping/Driver/FileDriver.php
index <HASH>..<HASH> 100644
--- a/lib/Prezent/Doctrine/Translatable/Mapping/Driver/FileDriver.php
+++ b/lib/Prezent/Doctrine/Translatable/Mapping/Driver/FileDriver.php
@@ -46,6 +46,8 @@ abstract class FileDriver implements DriverInterface
         if ($class->implementsInterface('Prezent\\Doctrine\\Translatable\\TranslationInterface')) {
             return $this->loadTranslationMetadata($class->name, $this->readMapping($class->name));
         }
+
+        return null;
     }
 
     /**
Always have a return statement, fixes #<I>