diff --git a/frontend/src/app/atomic/input/email-field/email-field.component.ts b/frontend/src/app/atomic/input/email-field/email-field.component.ts
index 9abf44f..c70d38a 100644
--- a/frontend/src/app/atomic/input/email-field/email-field.component.ts
+++ b/frontend/src/app/atomic/input/email-field/email-field.component.ts
@@ -28,7 +28,7 @@ export class EmailFieldComponent {
 
     @Output() valueChange = new EventEmitter<string>();
 
-    verify_mail() {
+    verify_mail(): boolean {
         return verify_email(this._value);
     }
 }
diff --git a/frontend/src/app/page/onboarding/registration/registration.component.ts b/frontend/src/app/page/onboarding/registration/registration.component.ts
index b43bf24..e559b48 100644
--- a/frontend/src/app/page/onboarding/registration/registration.component.ts
+++ b/frontend/src/app/page/onboarding/registration/registration.component.ts
@@ -31,7 +31,7 @@ export class RegistrationComponent implements OnInit {
         }
     }
 
-    verify_mail() {
+    verify_mail(): boolean {
         return verify_email(this.mail);
     }