diff --git a/src/plugins/diffeditor/diffeditorplugin.cpp b/src/plugins/diffeditor/diffeditorplugin.cpp
index 2a69205e43d112b92ea7879bc1858de1ea39ce57..7915ebaad4af181cdbb413986295208c0379a32b 100644
--- a/src/plugins/diffeditor/diffeditorplugin.cpp
+++ b/src/plugins/diffeditor/diffeditorplugin.cpp
@@ -175,9 +175,8 @@ void DiffEditorPlugin::diff()
     if (!document)
         return;
 
-    DiffEditorController *controller = DiffEditorController::controller(document);
-    if (!controller)
-        controller = new FileDiffController(document, fileName1, fileName2);
+    if (!DiffEditorController::controller(document))
+        new FileDiffController(document, fileName1, fileName2);
     Core::EditorManager::activateEditorForDocument(document);
     document->reload();
 }