diff --git a/package.json b/package.json
index 795cf83eff64d757a9c9d5283230f20a3964c06f..4fb82701406e05017adbd9de5b497cfee0be7eef 100644
--- a/package.json
+++ b/package.json
@@ -46,5 +46,6 @@
   },
   "bin": {
     "acorn": "bin/acorn"
-  }
+  },
+  "sideEffects": false
 }