diff --git a/client/src/utils/postalcode.ts b/client/src/utils/postalcode.ts
index e4fbc3b2..93177698 100644
--- a/client/src/utils/postalcode.ts
+++ b/client/src/utils/postalcode.ts
@@ -2,6 +2,6 @@ export function validatePostalCode(input: string) {
   if (input.length < 4) {
     return false;
   }
-  const regex = /^[0-9]/;
+  const regex = /^\d+$/;
   return regex.test(input);
 }