diff --git a/frontend/src/routes/(candidate)/(authenticated)/register/+page.svelte b/frontend/src/routes/(candidate)/(authenticated)/register/+page.svelte
index 03678bc..015c489 100644
--- a/frontend/src/routes/(candidate)/(authenticated)/register/+page.svelte
+++ b/frontend/src/routes/(candidate)/(authenticated)/register/+page.svelte
@@ -89,7 +89,10 @@
 			sex: yup.string(),
 			address: yup.string(),
 			street: yup.string().required(),
-			houseNumber: yup.number().required(),
+			houseNumber: yup
+				.string()
+				.required()
+				.matches(/^[0-9]+(\/[0-9]+)?$/),
 			city: yup.string().required(),
 			zip: yup.string().required(),
 			citizenship: yup.string().required(),