diff --git a/app/controllers/discourse_assign/assign_controller.rb b/app/controllers/discourse_assign/assign_controller.rb
index d40fd39..07a0480 100644
--- a/app/controllers/discourse_assign/assign_controller.rb
+++ b/app/controllers/discourse_assign/assign_controller.rb
@@ -90,7 +90,7 @@ module DiscourseAssign
         .includes(:tags)
         .includes(:user)
         .joins("JOIN topic_custom_fields tcf ON topics.id = tcf.topic_id AND tcf.name = 'assigned_to_id' AND tcf.value IS NOT NULL")
-        .order('tcf.value, topics.bumped_at desc')
+        .order('tcf.value::integer, topics.bumped_at desc')
         .offset(offset)
         .limit(limit)