diff --git a/src/model/model/model.ts b/src/model/model/model.ts
index 84a733f3..7f2a855b 100644
--- a/src/model/model/model.ts
+++ b/src/model/model/model.ts
@@ -51,7 +51,7 @@ export abstract class Model<TModelAttributes extends {} = any, TCreationAttribut
    * Sets relation between specified instances and source instance
    * (replaces old relations)
    */
-  $set<R extends Model>(propertyKey: keyof this, instances: R | R[] | string[] | string | number[] | number, options?: AssociationActionOptions): Promise<unknown> {
+  $set<R extends Model>(propertyKey: keyof this, instances: R | R[] | string[] | string | number[] | number | null, options?: AssociationActionOptions): Promise<unknown> {
     return this['set' + capitalize(propertyKey as string)](instances, options);
   }