diff --git a/inventory/group_vars/mbs_frontend b/inventory/group_vars/mbs_frontend
index 9cf0b6060f..84c1c5d319 100644
--- a/inventory/group_vars/mbs_frontend
+++ b/inventory/group_vars/mbs_frontend
@@ -42,3 +42,6 @@ csi_relationship: |
     It has no special credentials itself.  When a module build it submitted, it
     makes a note in the DB and publishes a fedmsg message.  The mbs backend
     nodes do all the work of talking to koji.
+
+mbs_broker_url: ""
+mbs_num_workers: 3
diff --git a/inventory/group_vars/mbs_frontend_stg b/inventory/group_vars/mbs_frontend_stg
index 3dc637144e..490ed9a651 100644
--- a/inventory/group_vars/mbs_frontend_stg
+++ b/inventory/group_vars/mbs_frontend_stg
@@ -52,3 +52,6 @@ csi_relationship: |
     It has no special credentials itself.  When a module build it submitted, it
     makes a note in the DB and publishes a fedmsg message.  The mbs backend
     nodes do all the work of talking to koji.
+
+mbs_broker_url: ""
+mbs_num_workers: 3