diff --git a/packages/babel-core/src/transformation/file/index.js b/packages/babel-core/src/transformation/file/index.js
index b7b9c14575..64a9564fc1 100644
--- a/packages/babel-core/src/transformation/file/index.js
+++ b/packages/babel-core/src/transformation/file/index.js
@@ -513,7 +513,7 @@ export default class File extends Store {
     }
   }
 
-  makeResult({ code, map, ast, ignored }: BabelFileResult): BabelFileResult {
+  makeResult({ code, map, ast, ignored } /*: BabelFileResult */): BabelFileResult {
     let result = {
       metadata: null,
       options:  this.opts,
diff --git a/packages/babel-traverse/src/path/lib/virtual-types.js b/packages/babel-traverse/src/path/lib/virtual-types.js
index cb598fe9a3..e879e66577 100644
--- a/packages/babel-traverse/src/path/lib/virtual-types.js
+++ b/packages/babel-traverse/src/path/lib/virtual-types.js
@@ -28,14 +28,14 @@ export let ReferencedMemberExpression = {
 
 export let BindingIdentifier = {
   types: ["Identifier"],
-  checkPath({ node, parent }: NodePath): boolean {
+  checkPath({ node, parent } /*: NodePath */): boolean {
     return t.isIdentifier(node) && t.isBinding(node, parent);
   }
 };
 
 export let Statement = {
   types: ["Statement"],
-  checkPath({ node, parent }: NodePath): boolean {
+  checkPath({ node, parent } /*: NodePath */): boolean {
     if (t.isStatement(node)) {
       if (t.isVariableDeclaration(node)) {
         if (t.isForXStatement(parent, { left: node })) return false;
@@ -106,7 +106,7 @@ export let Pure = {
 
 export let Flow = {
   types: ["Flow", "ImportDeclaration", "ExportDeclaration"],
-  checkPath({ node }: NodePath): boolean {
+  checkPath({ node } /*: NodePath */): boolean {
     if (t.isFlow(node)) {
       return true;
     } else if (t.isImportDeclaration(node)) {