diff --git a/types/sequelize/index.d.ts b/types/sequelize/index.d.ts
index f80d5acc40..88ed87efae 100644
--- a/types/sequelize/index.d.ts
+++ b/types/sequelize/index.d.ts
@@ -3908,6 +3908,7 @@ declare namespace sequelize {
          */
         findById<TCustomAttributes>(identifier?: number | string | Buffer, options?: FindOptions<TAttributes & TCustomAttributes>): Promise<TInstance | null>;
         findByPrimary<TCustomAttributes>(identifier?: number | string | Buffer, options?: FindOptions<TAttributes & TCustomAttributes>): Promise<TInstance | null>;
+        findByPk<TCustomAttributes>(identifier?: number | string | Buffer, options?: FindOptions<TAttributes & TCustomAttributes>): Promise<TInstance | null>;
 
         /**
          * Search for a single instance. This applies LIMIT 1, so the listener will always be called with a single
diff --git a/types/sequelize/sequelize-tests.ts b/types/sequelize/sequelize-tests.ts
index 4e0aa9a73d..6b7ea6ea0a 100644
--- a/types/sequelize/sequelize-tests.ts
+++ b/types/sequelize/sequelize-tests.ts
@@ -981,6 +981,10 @@ User.findByPrimary( 'a string' );
 User.findByPrimary( 42 );
 User.findByPrimary( Buffer.from('a buffer') );
 
+User.findByPk( 'a string' );
+User.findByPk( 42 );
+User.findByPk( Buffer.from('a buffer') );
+
 User.findOne( { where : { username : 'foo' } } );
 User.findOne( { where : { id : 1 }, attributes : ['id', ['username', 'name']] } );
 User.findOne( { where : { id : 1 }, attributes : ['id'] } );