diff --git a/acorn/src/index.js b/acorn/src/index.js
index 3ca74ccce..0834c9db1 100644
--- a/acorn/src/index.js
+++ b/acorn/src/index.js
@@ -54,6 +54,7 @@ export {
 }
 
 Parser.acorn = {
+  Parser,
   version,
   defaultOptions,
   Position,