diff --git a/src/structs.h b/src/structs.h
index 09a5665..0f37b8f 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -3252,6 +3252,7 @@
     int		use_aucmd_win;	/* using aucmd_win */
     win_T	*save_curwin;	/* saved curwin */
     win_T	*new_curwin;	/* new curwin */
+    win_T	*save_prevwin;	/* saved prevwin */
     bufref_T	new_curbuf;	/* new curbuf */
     char_u	*globaldir;	/* saved value of globaldir */
 } aco_save_T;