diff --git a/app/Instance.php b/app/Instance.php
index e9a61acaa..d4c73917a 100644
--- a/app/Instance.php
+++ b/app/Instance.php
@@ -6,5 +6,5 @@ use Illuminate\Database\Eloquent\Model;
 
 class Instance extends Model
 {
-    //
+    protected $fillable = ['domain'];
 }