diff --git a/package.json b/package.json
index eddf8bf8..48555f8d 100644
--- a/package.json
+++ b/package.json
@@ -123,7 +123,7 @@
   "devDependencies": {
     "@babel/core": "^7.2.2",
     "@babel/preset-env": "^7.2.0",
-    "ascjs": "^3.0.0",
+    "ascjs": "^2.5.1",
     "basichtml": "^0.21.0",
     "coveralls": "^3.0.2",
     "drop-babel-typeof": "^1.0.1",