diff --git a/kitty/child.py b/kitty/child.py
index 90e600e0d..d8c0162a7 100644
--- a/kitty/child.py
+++ b/kitty/child.py
@@ -148,6 +148,7 @@ def process_env() -> Dict[str, str]:
     ssl_env_var = getattr(sys, 'kitty_ssl_env_var', None)
     if ssl_env_var is not None:
         ans.pop(ssl_env_var, None)
+    ans.pop('KITTY_PREWARM_SOCKET', None)
     return ans