diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index df183a3..2c71ec0 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -948,7 +948,7 @@
 EX(CMD_tunmenu,		"tunmenu",	ex_menu,
 			EXTRA|TRLBAR|NOTRLCOM|USECTRLV|CMDWIN),
 EX(CMD_undo,		"undo",		ex_undo,
-			RANGE|NOTADR|COUNT|TRLBAR|CMDWIN),
+			RANGE|NOTADR|COUNT|ZEROR|TRLBAR|CMDWIN),
 EX(CMD_undojoin,	"undojoin",	ex_undojoin,
 			TRLBAR|CMDWIN),
 EX(CMD_undolist,	"undolist",	ex_undolist,