diff --git a/roles/matrix-bridge-appservice-kakaotalk/defaults/main.yml b/roles/matrix-bridge-appservice-kakaotalk/defaults/main.yml
index d2bc94f2..f27f75c5 100644
--- a/roles/matrix-bridge-appservice-kakaotalk/defaults/main.yml
+++ b/roles/matrix-bridge-appservice-kakaotalk/defaults/main.yml
@@ -117,7 +117,7 @@ matrix_appservice_kakaotalk_bridge_permissions: |
   }}
 
 matrix_appservice_kakaotalk_appservice_bot_username: kakaotalkbot
-matrix_appservice_kakaotalk_user_prefix: 'kakaotalk_as_'
+matrix_appservice_kakaotalk_user_prefix: 'kakaotalk_'
 
 # End-to-bridge encryption configuration
 matrix_appservice_kakaotalk_bridge_encryption_allow: false