diff --git a/stackrc b/stackrc
index 19674ed..34ccfa2 100644
--- a/stackrc
+++ b/stackrc
@@ -201,6 +201,10 @@
 VOLUME_NAME_PREFIX=${VOLUME_NAME_PREFIX:-volume-}
 INSTANCE_NAME_PREFIX=${INSTANCE_NAME_PREFIX:-instance-}
 
+# Set default port for nova-objectstore
+S3_SERVICE_PORT=${S3_SERVICE_PORT:-3333}
+
+# Common network names
 PRIVATE_NETWORK_NAME=${PRIVATE_NETWORK_NAME:-"private"}
 PUBLIC_NETWORK_NAME=${PUBLIC_NETWORK_NAME:-"nova"}