diff --git a/types/sequelize/index.d.ts b/types/sequelize/index.d.ts
index 701a735f14..dc8614cb68 100644
--- a/types/sequelize/index.d.ts
+++ b/types/sequelize/index.d.ts
@@ -3187,8 +3187,9 @@ declare namespace sequelize {
      * We did put Object in the end, because there where query might be a JSON Blob. It cripples a bit the
      * typesafety, but there is no way to pass the tests if we just remove it.
      */
+    type Primitives = string | number | boolean | Buffer;
     type WhereOptions<T> = {
-        [P in keyof T]?: string | number | boolean | WhereLogic | WhereOptions<T[P]> | col | and | or | WhereGeometryOptions | WhereNested | Array<string | number> | null;
+        [P in keyof T]?: Primitives | Array<Primitives> | WhereLogic | (T[P] extends Primitives ? null : WhereOptions<T[P]>) | col | and | or | WhereGeometryOptions | WhereNested | null;
     };
 
     /**
diff --git a/types/sequelize/sequelize-tests.ts b/types/sequelize/sequelize-tests.ts
index e2954e3637..bc0aa7d51d 100644
--- a/types/sequelize/sequelize-tests.ts
+++ b/types/sequelize/sequelize-tests.ts
@@ -922,6 +922,9 @@ User.findAll( { include : [{ model : Task, paranoid: false }] } );
 User.findAll( { transaction : t } );
 User.findAll( { where : { data : { name : { last : 's' }, employment : { $ne : 'a' } } }, order : [['id', 'ASC']] } );
 User.findAll( { where : { username : ['boo', 'boo2'] } } );
+User.findAll( { where : { username : Buffer.from("a name") } } );
+User.findAll( { where : { username : [Buffer.from("a name")] } } );
+User.findAll( { where : { username : [true] } } );
 User.findAll( { where : { username : { like : '%2' } } } );
 User.findAll( { where : { theDate : { '..' : ['2013-01-02', '2013-01-11'] } } } );
 User.findAll( { where : { intVal : { '!..' : [8, 10] } } } );