diff --git a/kitty/prewarm.py b/kitty/prewarm.py
index 715e05f09..d54bc6adb 100644
--- a/kitty/prewarm.py
+++ b/kitty/prewarm.py
@@ -463,6 +463,9 @@ def fork(self, free_non_child_resources: Callable[[], None]) -> None:
         if self.pid > 0:
             # master process
             os.close(w)
+            if self.tty_fd > -1:
+                os.close(self.tty_fd)
+                self.tty_fd = -1
             if self.stdin > -1:
                 os.close(self.stdin)
                 self.stdin = -1