diff --git a/server/vbv_lernwelt/course/views.py b/server/vbv_lernwelt/course/views.py
index a5b8ce2b..06e37ab5 100644
--- a/server/vbv_lernwelt/course/views.py
+++ b/server/vbv_lernwelt/course/views.py
@@ -1,3 +1,5 @@
+import uuid
+
 import structlog
 from django.shortcuts import get_object_or_404
 from rest_framework.decorators import api_view
@@ -75,9 +77,13 @@ def request_course_completion(request, course_session_id):
 
 
 @api_view(["GET"])
-def request_course_completion_for_user(request, course_session_id, user_id):
+def request_course_completion_for_user(
+    request, course_session_id: int, user_id: uuid.UUID
+):
     if can_view_course_completions(
-        user=request.user, course_session_id=course_session_id, target_user_id=user_id
+        user=request.user,  # noqa
+        course_session_id=course_session_id,
+        target_user_id=str(user_id),
     ):
         return _request_course_completion(course_session_id, user_id)
     raise PermissionDenied()