diff --git a/z.lua b/z.lua
index 6ca80f3..b410ebd 100755
--- a/z.lua
+++ b/z.lua
@@ -1480,7 +1480,7 @@ function _zlua
 	l e x t r c s i h/help A-add C-complete -- $argv
 
 	if test -n "$_flag_add"
-		set _ZL_RANDOM (random)
+		set -x _ZL_RANDOM (random)
 		eval "$ZLUA_LUAEXE" "$ZLUA_SCRIPT" --add $argv
 		return
 	else if test -n "$_flag_complete"