diff --git a/src/Factory/ControllerFactory.php b/src/Factory/ControllerFactory.php
index ddf477fe6c..07029d95f1 100644
--- a/src/Factory/ControllerFactory.php
+++ b/src/Factory/ControllerFactory.php
@@ -50,6 +50,7 @@ private function getController(string $controllerInterface, ?string $controllerF
             return null;
         }
 
+        $controllerFqcn = str_replace('%5C', '\\', $controllerFqcn);
         $newRequest = $request->duplicate(null, null, ['_controller' => [$controllerFqcn, $controllerAction]]);
         try {
             $controllerCallable = $this->controllerResolver->getController($newRequest);