diff --git a/tests/lib/Controller/SettingsController.php b/tests/lib/Controller/SettingsController.php
index c7e2e5b..3508478 100644
--- a/tests/lib/Controller/SettingsController.php
+++ b/tests/lib/Controller/SettingsController.php
@@ -443,7 +443,7 @@ public function throwingOther(): DataResponse {
 	/**
 	 * A route 204 response
 	 *
-	 * @return DataResponse<Http::STATUS_NO_CONTENT, array<empty>, array{}>
+	 * @return DataResponse<Http::STATUS_NO_CONTENT, array<empty>, array{X-Custom: string}>
 	 *
 	 * 204: No settings
 	 */
diff --git a/tests/openapi-administration.json b/tests/openapi-administration.json
index 5eec96f..d1bcdf2 100644
--- a/tests/openapi-administration.json
+++ b/tests/openapi-administration.json
@@ -2370,7 +2370,14 @@
                 ],
                 "responses": {
                     "204": {
-                        "description": "No settings"
+                        "description": "No settings",
+                        "headers": {
+                            "X-Custom": {
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
                     }
                 }
             }
diff --git a/tests/openapi-full.json b/tests/openapi-full.json
index 4b42bdb..f4c88bc 100644
--- a/tests/openapi-full.json
+++ b/tests/openapi-full.json
@@ -2497,7 +2497,14 @@
                 ],
                 "responses": {
                     "204": {
-                        "description": "No settings"
+                        "description": "No settings",
+                        "headers": {
+                            "X-Custom": {
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
                     }
                 }
             }