diff --git a/endpoints/api/repository.py b/endpoints/api/repository.py
index ec80269b1..1ae77b6a2 100644
--- a/endpoints/api/repository.py
+++ b/endpoints/api/repository.py
@@ -218,7 +218,7 @@ class RepositoryList(ApiResource):
         repo['last_modified'] = last_modified_map.get(repo_id)
 
       if parsed_args['popularity']:
-        repo['popularity'] = action_sum_map.get(repo_id, 0)
+        repo['popularity'] = float(action_sum_map.get(repo_id, 0))
 
       if username:
         repo['is_starred'] = repo_id in star_set