diff --git a/lib/rollout_ui/feature.rb b/lib/rollout_ui/feature.rb
index 43d4c62..e19a082 100644
--- a/lib/rollout_ui/feature.rb
+++ b/lib/rollout_ui/feature.rb
@@ -18,7 +18,7 @@ def groups
     end
 
     def user_ids
-      rollout.get(feature_for(name)).users
+      rollout.get(feature_for(name)).users.to_a
     end
 
     def percentage=(percentage_val)