diff --git a/bots/modules/ping.py b/bots/modules/ping.py
index a37246a..d753777 100644
--- a/bots/modules/ping.py
+++ b/bots/modules/ping.py
@@ -19,7 +19,7 @@ class PingBotCategory(models.Model):
 
     def remove_user(self, uid: int):
         user_ids = set(self.user_ids or [])
-        user_ids.add(uid)
+        user_ids.remove(uid)
         self.user_ids = list(user_ids)
 
     class Meta: