diff --git a/src/controllers/03-employee-controller.ts b/src/controllers/03-employee-controller.ts
index 03ab1cc..95addd7 100644
--- a/src/controllers/03-employee-controller.ts
+++ b/src/controllers/03-employee-controller.ts
@@ -74,7 +74,7 @@ type EmployeeCreate = {
   dateOfBirth?: Date | null;
   gender: string;
   nationality: string;
-  otherNationality?: string;
+  otherNationality?: string | null;
 
   namePrefix?: string | null;
   firstName?: string;
@@ -111,7 +111,7 @@ type EmployeeUpdate = {
   dateOfBirth?: Date;
   gender?: string;
   nationality?: string;
-  otherNationality?: string;
+  otherNationality?: string | null;
 
   namePrefix?: string | null;
   firstName?: string;