diff --git a/dashboard/src/views/EmailMailboxesView.vue b/dashboard/src/views/EmailMailboxesView.vue
index b2fe36f3c..4f0b11a6a 100644
--- a/dashboard/src/views/EmailMailboxesView.vue
+++ b/dashboard/src/views/EmailMailboxesView.vue
@@ -273,6 +273,7 @@ onMounted(async () => {
         </template>
         <template #storageQuota="mailbox">
           <span v-if="mailbox.usage && mailbox.usage.quotaLimit">{{ prettyDecimalSize(mailbox.usage.quotaLimit) }}</span>
+          <span v-else>-</span>
         </template>
         <template #actions="mailbox">
           <div style="text-align: right;">