diff --git a/mautrix_telegram/matrix.py b/mautrix_telegram/matrix.py
index 15e02b1d..5f521ddb 100644
--- a/mautrix_telegram/matrix.py
+++ b/mautrix_telegram/matrix.py
@@ -183,7 +183,7 @@ class MatrixHandler(BaseMatrixHandler):
         if not portal:
             return
 
-        if sender == self.az.bot_mxid:
+        if user_id == self.az.bot_mxid:
             # Direct chat portal unbridging is handled in portal.kick_matrix
             if portal.peer_type != "user":
                 await portal.unbridge()