diff --git a/types/mongoose/index.d.ts b/types/mongoose/index.d.ts
index b7d3b5d9c6..800b37f520 100644
--- a/types/mongoose/index.d.ts
+++ b/types/mongoose/index.d.ts
@@ -16,6 +16,7 @@
 //                 Dan Manastireanu <https://github.com/danmana>
 //                 stablio <https://github.com/stablio>
 //                 Emmanuel Gautier <https://github.com/emmanuelgautier>
+//                 Frontend Monster <https://github.com/frontendmonster>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -1310,7 +1311,7 @@ declare module "mongoose" {
      * @param kind optional kind property for the error
      * @returns the current ValidationError, with all currently invalidated paths
      */
-    invalidate(path: string, errorMsg: string | NativeError, value: any, kind?: string): Error.ValidationError | boolean;
+    invalidate(path: string, errorMsg: string | NativeError, value?: any, kind?: string): Error.ValidationError | boolean;
 
     /** Returns true if path was directly set and modified, else false. */
     isDirectModified(path: string): boolean;
diff --git a/types/mongoose/mongoose-tests.ts b/types/mongoose/mongoose-tests.ts
index 8e6a60fdc7..30b5b51a84 100644
--- a/types/mongoose/mongoose-tests.ts
+++ b/types/mongoose/mongoose-tests.ts
@@ -726,6 +726,7 @@ doc.execPopulate().then(function (arg) {
 doc.get('path', Number);
 doc.init(doc).init(doc, {});
 doc.inspect();
+doc.invalidate('path', new Error('hi')).toString();
 doc.invalidate('path', new Error('hi'), 999).toString();
 doc.isDirectModified('path').valueOf();
 doc.isInit('path').valueOf();