diff --git a/eslint/babel-eslint-parser/acorn-to-esprima.js b/eslint/babel-eslint-parser/acorn-to-esprima.js
index a441043b5e..ca6516526d 100644
--- a/eslint/babel-eslint-parser/acorn-to-esprima.js
+++ b/eslint/babel-eslint-parser/acorn-to-esprima.js
@@ -39,6 +39,7 @@ exports.toToken = function (token) {
 };
 
 exports.toAST = function (ast) {
+  ast.sourceType = "module";
   traverse(ast, astTransformVisitor);
 };