diff --git a/eslint/babel-eslint-parser/acorn-to-esprima.js b/eslint/babel-eslint-parser/acorn-to-esprima.js
index c0d02a5392..3dab2d6e10 100644
--- a/eslint/babel-eslint-parser/acorn-to-esprima.js
+++ b/eslint/babel-eslint-parser/acorn-to-esprima.js
@@ -235,11 +235,6 @@ var astTransformVisitor = {
 
     // functions
 
-    if (this.isFunction()) {
-      if (node.async) node.generator = true;
-      delete node.async;
-    }
-
     if (this.isAwaitExpression()) {
       node.type = "YieldExpression";
       node.delegate = node.all;