diff --git a/lib/avo/concerns/has_action_stimulus_controllers.rb b/lib/avo/concerns/has_action_stimulus_controllers.rb
index 441e4c2e06..5cbff364ba 100644
--- a/lib/avo/concerns/has_action_stimulus_controllers.rb
+++ b/lib/avo/concerns/has_action_stimulus_controllers.rb
@@ -4,7 +4,7 @@ module HasActionStimulusControllers
       extend ActiveSupport::Concern
 
       included do
-        class_attribute :stimulus_controllers, default: ""
+        class_attribute :stimulus_controllers, default: []
       end
 
       def get_stimulus_controllers