diff --git a/packages/babel-core/src/transformation/file/index.js b/packages/babel-core/src/transformation/file/index.js
index 2797f68b95..b827c4b0bc 100644
--- a/packages/babel-core/src/transformation/file/index.js
+++ b/packages/babel-core/src/transformation/file/index.js
@@ -77,8 +77,6 @@ export default class File {
     this.hub = new Hub(this);
   }
 
-  static helpers: Array<string>;
-
   pluginPasses: Array<Array<[Plugin, Object]>>;
   parserOpts: BabelParserOptions;
   opts: Object;