diff --git a/frontend/src/pages/cert-manager/AlertingPage/components/PkiAlertModal.tsx b/frontend/src/pages/cert-manager/AlertingPage/components/PkiAlertModal.tsx
index 4540c6def..04fafa0b2 100644
--- a/frontend/src/pages/cert-manager/AlertingPage/components/PkiAlertModal.tsx
+++ b/frontend/src/pages/cert-manager/AlertingPage/components/PkiAlertModal.tsx
@@ -32,9 +32,9 @@ enum TimeUnit {
 const schema = z.object({
   name: z.string().trim().min(1),
   pkiCollectionId: z.string().min(1),
-  alertBefore: z.string(),
+  alertBefore: z.string().min(1),
   alertUnit: z.nativeEnum(TimeUnit),
-  emails: z.string().trim()
+  emails: z.string().trim().min(1)
 });
 
 const convertToDays = (unit: TimeUnit, value: number) => {