diff --git a/kitty/window.py b/kitty/window.py
index d8198e661..f53dac807 100644
--- a/kitty/window.py
+++ b/kitty/window.py
@@ -256,6 +256,7 @@ class WindowDict(TypedDict):
     cmdline: list[str]
     last_reported_cmdline: str
     last_cmd_exit_status: int
+    last_focused_at: float
     env: dict[str, str]
     foreground_processes: list[ProcessDesc]
     is_self: bool