diff --git a/types/sequelize/index.d.ts b/types/sequelize/index.d.ts
index 73e3f3c222..23f620d8ba 100644
--- a/types/sequelize/index.d.ts
+++ b/types/sequelize/index.d.ts
@@ -3198,7 +3198,7 @@ declare namespace sequelize {
      */
     type Primitives = string | number | boolean | Buffer;
     type WhereOptions<T> = {
-        [P in keyof T]?: Primitives | Array<Primitives> | WhereLogic | (T[P] extends Primitives ? null : WhereOptions<T[P]>) | col | and | or | WhereGeometryOptions | WhereNested | null;
+        [P in keyof T]?: Primitives | Array<Primitives> | WhereLogic | (T[P] extends Primitives ? null : WhereOptions<T[P]>) | col | and | or | WhereGeometryOptions | WhereNested | where | null;
     };
 
     /**
diff --git a/types/sequelize/sequelize-tests.ts b/types/sequelize/sequelize-tests.ts
index 588b3728d2..520eb8a724 100644
--- a/types/sequelize/sequelize-tests.ts
+++ b/types/sequelize/sequelize-tests.ts
@@ -997,6 +997,9 @@ User.findAll( { where: { $and:[ { username: { $not: "user" } }, { theDate: new D
 User.findAll( { where: { $or:[ { username: { $not: "user" } }, { theDate: new Date() } ] } } );
 User.findAll( { where: { emails: { $overlap: ["me@mail.com", "you@mail.com"] } } } );
 
+var options: Sequelize.AnyFindOptions = { where: { $and: Sequelize.where( Sequelize.fn( 'char_length', Sequelize.col('username') ), 4 ) } };
+User.findAll( options );
+
 User.findById( 'a string' );
 User.findById( 42 );
 User.findById( Buffer.from('a buffer') );