diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index ca027676da..4de6de6865 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -18,3 +18,19 @@ jobs:
         coverage: none
     - name: Lint
       run: composer run lint
+
+  php-cs-fixer:
+    name: php-cs check
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+    - name: Set up php
+      uses: shivammathur/setup-php@master
+      with:
+        php-version: 7.4
+        coverage: none
+    - name: Install dependencies
+      run: composer i
+    - name: Run coding standards check
+      run: composer run cs:check || ( echo 'Please run `composer run cs:fix` to format your code' && exit 1 )
diff --git a/apps/provisioning_api/tests/Controller/GroupsControllerTest.php b/apps/provisioning_api/tests/Controller/GroupsControllerTest.php
index 34bcdd4e64..72f0cd5537 100644
--- a/apps/provisioning_api/tests/Controller/GroupsControllerTest.php
+++ b/apps/provisioning_api/tests/Controller/GroupsControllerTest.php
@@ -558,7 +558,7 @@ class GroupsControllerTest extends \Test\TestCase {
 
 		$this->userManager->expects($this->any())
 			->method('get')
-			->willReturnCallback(function(string $uid) use ($users) {
+			->willReturnCallback(function (string $uid) use ($users) {
 				return isset($users[$uid]) ? $users[$uid] : null;
 			});