diff --git a/lib/public/AppFramework/Middleware.php b/lib/public/AppFramework/Middleware.php
index 62b5e47c4cf04..91d8b7617bb26 100644
--- a/lib/public/AppFramework/Middleware.php
+++ b/lib/public/AppFramework/Middleware.php
@@ -25,6 +25,7 @@
  */
 namespace OCP\AppFramework;
 
+use Exception;
 use OCP\AppFramework\Http\Response;
 
 /**
@@ -45,7 +46,7 @@ abstract class Middleware {
 	 * @return void
 	 * @since 6.0.0
 	 */
-	public function beforeController($controller, $methodName) {
+	public function beforeController(Controller $controller, string $methodName) {
 	}
 
 
@@ -59,12 +60,12 @@ public function beforeController($controller, $methodName) {
 	 * @param Controller $controller the controller that is being called
 	 * @param string $methodName the name of the method that will be called on
 	 *                           the controller
-	 * @param \Exception $exception the thrown exception
-	 * @throws \Exception the passed in exception if it can't handle it
+	 * @param Exception $exception the thrown exception
+	 * @throws Exception the passed in exception if it can't handle it
 	 * @return Response a Response object in case that the exception was handled
 	 * @since 6.0.0
 	 */
-	public function afterException($controller, $methodName, \Exception $exception) {
+	public function afterException(Controller $controller, string $methodName, Exception $exception) {
 		throw $exception;
 	}
 
@@ -80,7 +81,7 @@ public function afterException($controller, $methodName, \Exception $exception)
 	 * @return Response a Response object
 	 * @since 6.0.0
 	 */
-	public function afterController($controller, $methodName, Response $response) {
+	public function afterController(Controller $controller, string $methodName, Response $response) {
 		return $response;
 	}
 
@@ -96,7 +97,7 @@ public function afterController($controller, $methodName, Response $response) {
 	 * @return string the output that should be printed
 	 * @since 6.0.0
 	 */
-	public function beforeOutput($controller, $methodName, $output) {
+	public function beforeOutput(Controller $controller, string $methodName, string $output) {
 		return $output;
 	}
 }
diff --git a/tests/lib/AppFramework/Middleware/MiddlewareTest.php b/tests/lib/AppFramework/Middleware/MiddlewareTest.php
index f9d8926db7e25..f9e775269d4eb 100644
--- a/tests/lib/AppFramework/Middleware/MiddlewareTest.php
+++ b/tests/lib/AppFramework/Middleware/MiddlewareTest.php
@@ -70,27 +70,27 @@ protected function setUp(): void {
 	}
 
 
-	public function testBeforeController() {
-		$this->middleware->beforeController($this->controller, null);
+	public function testBeforeController(): void {
+		$this->middleware->beforeController($this->controller, '');
 		$this->assertNull(null);
 	}
 
 
-	public function testAfterExceptionRaiseAgainWhenUnhandled() {
+	public function testAfterExceptionRaiseAgainWhenUnhandled(): void {
 		$this->expectException(\Exception::class);
-		$this->middleware->afterException($this->controller, null, $this->exception);
+		$this->middleware->afterException($this->controller, '', $this->exception);
 	}
 
 
-	public function testAfterControllerReturnResponseWhenUnhandled() {
-		$response = $this->middleware->afterController($this->controller, null, $this->response);
+	public function testAfterControllerReturnResponseWhenUnhandled(): void {
+		$response = $this->middleware->afterController($this->controller, '', $this->response);
 
 		$this->assertEquals($this->response, $response);
 	}
 
 
-	public function testBeforeOutputReturnOutputhenUnhandled() {
-		$output = $this->middleware->beforeOutput($this->controller, null, 'test');
+	public function testBeforeOutputReturnOutputhenUnhandled(): void {
+		$output = $this->middleware->beforeOutput($this->controller, '', 'test');
 
 		$this->assertEquals('test', $output);
 	}