diff --git a/apps/webhooks/lib/ResponseDefinitions.php b/apps/webhooks/lib/ResponseDefinitions.php
index a8c188d2a59..ea31de931ac 100644
--- a/apps/webhooks/lib/ResponseDefinitions.php
+++ b/apps/webhooks/lib/ResponseDefinitions.php
@@ -16,7 +16,7 @@ namespace OCA\Webhooks;
  *     httpMethod: string,
  *     uri: string,
  *     event?: string,
- *     eventFilter?: array<mixed>,
+ *     eventFilter?: array<string,mixed>,
  *     headers?: array<string,string>,
  *     authMethod: string,
  *     authData?: array<string,mixed>,
diff --git a/apps/webhooks/openapi.json b/apps/webhooks/openapi.json
index 13bc1a7fb5f..bdcc8007270 100644
--- a/apps/webhooks/openapi.json
+++ b/apps/webhooks/openapi.json
@@ -46,8 +46,8 @@
                         "type": "string"
                     },
                     "eventFilter": {
-                        "type": "array",
-                        "items": {
+                        "type": "object",
+                        "additionalProperties": {
                             "type": "object"
                         }
                     },