diff --git a/private/attributes b/private/attributes
index 991bac1..77143a3 100644
--- a/private/attributes
+++ b/private/attributes
@@ -10,3 +10,7 @@
 # property owner attributes must be exclusive.
 attribute system_and_vendor_property_type;
 expandattribute system_and_vendor_property_type false;
+
+# All SDK sandbox domains
+attribute sdk_sandbox_all;
+