diff --git a/app/controllers/subscription_controller.rb b/app/controllers/subscription_controller.rb
index 59a99ec23a5..798c2dad3da 100644
--- a/app/controllers/subscription_controller.rb
+++ b/app/controllers/subscription_controller.rb
@@ -159,7 +159,8 @@ def multiple_add
               if request.xhr?
                 render json: true
               else
-                flash[:notice] = "You are now following #{params[:tagnames].join(', ')}."
+                tagnames = params[:tagnames].class == Array ? params[:tagnames].join(', ') : params[:tagnames]
+                flash[:notice] = "You are now following #{tagnames}."
                 redirect_to return_to
               end
             end