diff --git a/kitty/window.py b/kitty/window.py
index 5c92fd612..9c7e4423b 100644
--- a/kitty/window.py
+++ b/kitty/window.py
@@ -395,6 +395,8 @@ def send_cmd_response(self, response):
 
     def clipboard_control(self, data):
         where, text = data.partition(';')[::2]
+        if not where:
+            where = 's0'
         if text == '?':
             response = None
             if 's' in where or 'c' in where: