diff --git a/scripts/combine.lua b/scripts/combine.lua
index bbacf7b..652a0fd 100644
--- a/scripts/combine.lua
+++ b/scripts/combine.lua
@@ -46,7 +46,7 @@ end
 
 for i = 1, len do
     ngx.log(ngx.INFO, "COMBINE FILE -> ", images[i])
-    incoming = file_dir .. "/" .. images[i]
+    local incoming = file_dir .. "/" .. images[i]
     origin[i] = incoming .. ".png "
     local cmd = convert .. " -resize 642x1389 -strip -quality 75% " .. incoming .. " " .. origin[i]
     ngx.log(ngx.INFO, 'CMD RESIZE -> ', cmd)