diff --git a/types/mongoose/index.d.ts b/types/mongoose/index.d.ts
index 5963be87ed..3672b75b8f 100644
--- a/types/mongoose/index.d.ts
+++ b/types/mongoose/index.d.ts
@@ -811,11 +811,11 @@ declare module "mongoose" {
      * @param fn callback
      */
     post<T extends Document>(method: string, fn: (
-      error: mongodb.MongoError, doc: T, next: (err?: NativeError) => void
+      doc: T, next: (err?: NativeError) => void
     ) => void): this;
 
     post<T extends Document>(method: string, fn: (
-      doc: T, next: (err?: NativeError) => void
+      error: mongodb.MongoError, doc: T, next: (err?: NativeError) => void
     ) => void): this;
 
     /**
diff --git a/types/mongoose/mongoose-tests.ts b/types/mongoose/mongoose-tests.ts
index c8873f85b3..f713ba8538 100644
--- a/types/mongoose/mongoose-tests.ts
+++ b/types/mongoose/mongoose-tests.ts
@@ -491,12 +491,12 @@ preHookTestSchemaArr.push(
 );
 
 schema
-.post('save', function (error, doc, next) {
+.post('save', function (error: mongoose.Error, doc: mongoose.Document, next: (err?: mongoose.NativeError) => void) {
   error.stack;
   doc.model;
   next.apply;
 })
-.post('save', function (doc: mongoose.Document, next: Function) {
+.post('save', function (doc: mongoose.Document, next: (err?: mongoose.NativeError) => void) {
   doc.model;
   next(new Error());
 })