diff --git a/package.json b/package.json
index 5ea760f..7b9b1ac 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "3.0.0",
   "description": "Determine whether an AST node is a reference",
   "type": "module",
+  "main": "src/index.js",
   "module": "src/index.js",
   "types": "types/index.d.ts",
   "exports": {