diff --git a/docker/compute_worker/compute_worker.py b/docker/compute_worker/compute_worker.py
index 04e3f74bd..8f13a5a85 100644
--- a/docker/compute_worker/compute_worker.py
+++ b/docker/compute_worker/compute_worker.py
@@ -261,7 +261,7 @@ def get_detailed_results_file_path(self):
 
     async def send_detailed_results(self, file_path):
         logger.info(f"Updating detailed results {file_path} - {self.detailed_results_url}")
-        self._put_file(self.detailed_results_url, file=file_path, content_type='')
+        self._put_file(self.detailed_results_url, file=file_path, content_type='text/html')
         async with websockets.connect(self.websocket_url) as websocket:
             await websocket.send(json.dumps({
                 "kind": 'detailed_result_update',
diff --git a/src/apps/competitions/tasks.py b/src/apps/competitions/tasks.py
index 60f2a0618..e8bbddaee 100644
--- a/src/apps/competitions/tasks.py
+++ b/src/apps/competitions/tasks.py
@@ -142,7 +142,7 @@ def _send_to_compute_worker(submission, is_scoring):
             run_args['detailed_results_url'] = make_url_sassy(
                 path=submission.detailed_result.name,
                 permission='w',
-                content_type=''
+                content_type='text/html'
             )
         run_args['prediction_result'] = make_url_sassy(
             path=submission.prediction_result.name,