diff --git a/app/controllers/subscription_controller.rb b/app/controllers/subscription_controller.rb
index 001eecfda6..a0473440c4 100644
--- a/app/controllers/subscription_controller.rb
+++ b/app/controllers/subscription_controller.rb
@@ -53,7 +53,7 @@ def add
         end
 
         # test for uniqueness, handle it as a validation error if you like
-        if TagSelection.where(following: true, user_id: current_user.uid, tid: tag.tid).positive?
+        if TagSelection.where(following: true, user_id: current_user.uid, tid: tag.tid).length.positive?
           flash[:error] = "You are already subscribed to '#{params[:name]}'"
           redirect_to "/subscriptions" + "?_=" + Time.now.to_i.to_s
         else