diff --git a/combine.lua b/combine.lua
index afe63a7..9ee5453 100644
--- a/combine.lua
+++ b/combine.lua
@@ -32,7 +32,7 @@ if not magick then
     magick = ""
 end
 
-local cmd = magick .. " convert -append " .. table.concat(origin, " ") .. " " .. combined  
+local cmd = magick .. " " .. convert .. " -append " .. table.concat(origin, " ") .. " " .. combined  
 ngx.log(ngx.INFO, 'CMD -> ', cmd)
 local result, _, code = os.execute(cmd)
 if result and code == 0 then
diff --git a/music-room-test.conf b/music-room-test.conf
index 77bd95b..ca9ef67 100644
--- a/music-room-test.conf
+++ b/music-room-test.conf
@@ -53,6 +53,7 @@ server {
 
     #set $resty_loc "/usr/local/openresty";
     set $resty_loc "/usr/local/opt/openresty"; # MacOS
+    set $convert "/usr/local/bin/convert";
 
     location / {
         try_files $uri $uri/ /index.html;