1 files changed, 1 insertions, 1 deletions

diff --git a/src/window.h b/src/window.h
index e2e7a7f691f..4b32edd2149 100644
--- a/src/window.h
+++ b/src/window.h
@@ -776,7 +776,7 @@ extern void freeze_window_starts (struct frame *, int);
 extern void grow_mini_window (struct window *, int);
 extern void shrink_mini_window (struct window *);
 extern int window_relative_x_coord (struct window *, enum window_part, int);
-extern void check_all_windows (void);
+extern void check_all_windows (void) EXTERNALLY_VISIBLE;
 
 void run_window_configuration_change_hook (struct frame *f);