diff --git a/src/window.c b/src/window.c
index 3405285..6b86825 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4633,7 +4633,7 @@
 leave_tabpage(
     buf_T	*new_curbuf UNUSED,    // what is going to be the new curbuf,
 				       // NULL if unknown
-    int		trigger_leave_autocmds UNUSED)
+    int		trigger_leave_autocmds)
 {
     tabpage_T	*tp = curtab;