diff --git a/estree/flow.d.ts b/estree/flow.d.ts
index 43281c6c81..7ebb56e500 100644
--- a/estree/flow.d.ts
+++ b/estree/flow.d.ts
@@ -4,9 +4,7 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 declare module ESTree {
-  interface FlowTypeAnnotation extends Node {
-    _flowTypeAnnotationBrand: any;
-  }
+  interface FlowTypeAnnotation extends Node {}
 
   interface FlowBaseTypeAnnotation extends FlowTypeAnnotation {}