diff --git a/dashboard/src/components/MailboxDialog.vue b/dashboard/src/components/MailboxDialog.vue
index 58a046d1e..54ebea745 100644
--- a/dashboard/src/components/MailboxDialog.vue
+++ b/dashboard/src/components/MailboxDialog.vue
@@ -89,7 +89,8 @@ defineExpose({
     aliases.value = m ? JSON.parse(JSON.stringify(m.aliases)) : [];
     active.value = m ? m.active : true;
     enablePop3.value = m ? m.enablePop3 : false;
-
+    storageQuotaEnabled.value = m && m.storageQuota ? true : false;
+    storageQuota.value = m ? m.storageQuota : 5*1000*1000*1000;
     usersAndGroups.value = props.users.concat(props.groups);
 
     // unify on .name for multiselect