diff --git a/packages/babel-helper-remap-async-to-generator/src/index.js b/packages/babel-helper-remap-async-to-generator/src/index.js
index 00bccfa42b..64c2a47439 100644
--- a/packages/babel-helper-remap-async-to-generator/src/index.js
+++ b/packages/babel-helper-remap-async-to-generator/src/index.js
@@ -152,6 +152,11 @@ function plainFunction(path: NodePath, callId: Object) {
 }
 
 export default function (path: NodePath, file: Object, helpers: Object) {
+  if (!helpers) {
+    // bc for 6.15 and earlier
+    helpers = { wrapAsync: file };
+    file = null;
+  }
   path.traverse(awaitVisitor, {
     file,
     wrapAwait: helpers.wrapAwait