diff --git a/types/mongoose/index.d.ts b/types/mongoose/index.d.ts
index 17176079ca..d67c143da1 100644
--- a/types/mongoose/index.d.ts
+++ b/types/mongoose/index.d.ts
@@ -2276,6 +2276,12 @@ declare module "mongoose" {
     /** Adds a collation. */
     collation(options: CollationOptions): this;
 
+    /**
+     * Appends a new $count operator to this aggregate pipeline.
+     * @param countName name of the count field
+     */
+    count(countName: string): this;
+
     /**
      * Sets the cursor option option for the aggregation query (ignored for < 2.6.0).
      * Note the different syntax below: .exec() returns a cursor object, and no callback
diff --git a/types/mongoose/mongoose-tests.ts b/types/mongoose/mongoose-tests.ts
index 90259483f2..796ae086e3 100644
--- a/types/mongoose/mongoose-tests.ts
+++ b/types/mongoose/mongoose-tests.ts
@@ -1200,6 +1200,7 @@ aggregate.allowDiskUse(true).allowDiskUse(false, []);
 aggregate.append({ $project: { field: 1 }}, { $limit: 2 });
 aggregate.append([{ $match: { daw: 'Logic Audio X' }} ]);
 aggregate.collation({ locale: 'en_US', strength: 1 });
+aggregate.count('countName');
 aggregate.cursor({ batchSize: 1000 }).exec().each(cb);
 aggregate.exec().then(cb).catch(cb);
 aggregate.option({foo: 'bar'}).exec();