diff --git a/src/autocmd.c b/src/autocmd.c
index 7e4a1b2..41a4695 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -1607,7 +1607,7 @@
 	p_acd = FALSE;
 #endif
 
-	(void)win_split_ins(0, WSP_TOP, auc_win, 0);
+	(void)win_split_ins(0, WSP_TOP | WSP_FORCE_ROOM, auc_win, 0);
 	(void)win_comp_pos();   // recompute window positions
 	p_ea = save_ea;
 #ifdef FEAT_AUTOCHDIR