diff --git a/api/controllers/console/files.py b/api/controllers/console/files.py
index 34f186e2f0..2b63f6febc 100644
--- a/api/controllers/console/files.py
+++ b/api/controllers/console/files.py
@@ -108,4 +108,4 @@ class FileSupportTypeApi(Resource):
     @login_required
     @account_initialization_required
     def get(self):
-        return {"allowed_extensions": DOCUMENT_EXTENSIONS}
+        return {"allowed_extensions": list(DOCUMENT_EXTENSIONS)}