diff --git a/lib/types.js b/lib/types.js
index 92be02f84d..e4003bffb9 100644
--- a/lib/types.js
+++ b/lib/types.js
@@ -1727,6 +1727,7 @@ declare module "babel-types" {
   declare function isTSType(node: Object, opts?: ?Object): boolean
   declare function isNumberLiteral(node: Object, opts?: ?Object): boolean
   declare function isRegexLiteral(node: Object, opts?: ?Object): boolean
+  declare function validate(n: BabelNode, key: string, value: mixed): void;
   declare function clone<T>(n: T): T;
   declare function cloneDeep<T>(n: T): T;
   declare function removeProperties<T>(n: T, opts: ?{}): void;
diff --git a/scripts/generate-interfaces.js b/scripts/generate-interfaces.js
index b8595f70f7..5eeaac1d65 100644
--- a/scripts/generate-interfaces.js
+++ b/scripts/generate-interfaces.js
@@ -136,6 +136,7 @@ for (let i = 0; i < t.TYPES.length; i++) {
 }
 
 lines.push(
+  `declare function validate(n: BabelNode, key: string, value: mixed): void;`,
   `declare function clone<T>(n: T): T;`,
   `declare function cloneDeep<T>(n: T): T;`,
   `declare function removeProperties<T>(n: T, opts: ?{}): void;`,