diff --git a/ace-loader/npm-install.js b/ace-loader/npm-install.js
index 46947632489941f1c570f099fadb34161b5c1c4f..e0392766cceccdb2af54515de24a74eb39c620c8 100644
--- a/ace-loader/npm-install.js
+++ b/ace-loader/npm-install.js
@@ -26,11 +26,11 @@ if (!fs.existsSync(arkDir)) {
 var isWin = !1;
 var isMac = !1;
 
-if (fs.existsSync(path.join(arkDir, "build"))) {
+if (fs.existsSync(path.join(arkDir, "build-win"))) {
     isWin = !0;
-} else if (fs.existsSync(path.join(arkDir, "build-win"))) {
+} else if (fs.existsSync(path.join(arkDir, "build-mac"))) {
     isMac = !0;
-} else if (!fs.existsSync(path.join(arkDir, "build-mac"))) {
+} else if (!fs.existsSync(path.join(arkDir, "build"))) {
     throw Error("Error: find build fail").message;
 }
 
@@ -48,4 +48,4 @@ exec("npm install", { cwd: cwd }, function (err, stdout, stderr) {
     if (err != null) {
         throw Error(`npm install filed: ${err}`).message;
     }
-});
\ No newline at end of file
+});