diff --git a/lib/ceilometer b/lib/ceilometer
index 9db0640940..e2400833c8 100644
--- a/lib/ceilometer
+++ b/lib/ceilometer
@@ -169,7 +169,7 @@ function configure_ceilometer {
     [ ! -d $CEILOMETER_API_LOG_DIR ] &&  sudo mkdir -m 755 -p $CEILOMETER_API_LOG_DIR
     sudo chown $STACK_USER $CEILOMETER_API_LOG_DIR
 
-    iniset_rpc_backend ceilometer $CEILOMETER_CONF DEFAULT
+    iniset_rpc_backend ceilometer $CEILOMETER_CONF
 
     iniset $CEILOMETER_CONF DEFAULT notification_topics "$CEILOMETER_NOTIFICATION_TOPICS"
     iniset $CEILOMETER_CONF DEFAULT verbose True
diff --git a/lib/cinder b/lib/cinder
index 880af1fd40..a8f05389b5 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -281,7 +281,7 @@ function configure_cinder {
         iniset $CINDER_CONF DEFAULT use_syslog True
     fi
 
-    iniset_rpc_backend cinder $CINDER_CONF DEFAULT
+    iniset_rpc_backend cinder $CINDER_CONF
 
     if [[ "$CINDER_SECURE_DELETE" == "False" ]]; then
         iniset $CINDER_CONF DEFAULT secure_delete False
diff --git a/lib/glance b/lib/glance
index eb1df2e8ae..8400ca18cc 100755
--- a/lib/glance
+++ b/lib/glance
@@ -112,7 +112,7 @@ function configure_glance {
     if is_service_enabled qpid || [ -n "$RABBIT_HOST" ] && [ -n "$RABBIT_PASSWORD" ]; then
         iniset $GLANCE_REGISTRY_CONF DEFAULT notification_driver messaging
     fi
-    iniset_rpc_backend glance $GLANCE_REGISTRY_CONF DEFAULT
+    iniset_rpc_backend glance $GLANCE_REGISTRY_CONF
 
     cp $GLANCE_DIR/etc/glance-api.conf $GLANCE_API_CONF
     iniset $GLANCE_API_CONF DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL
@@ -125,7 +125,7 @@ function configure_glance {
     if is_service_enabled qpid || [ -n "$RABBIT_HOST" ] && [ -n "$RABBIT_PASSWORD" ]; then
         iniset $GLANCE_API_CONF DEFAULT notification_driver messaging
     fi
-    iniset_rpc_backend glance $GLANCE_API_CONF DEFAULT
+    iniset_rpc_backend glance $GLANCE_API_CONF
     if [ "$VIRT_DRIVER" = 'xenserver' ]; then
         iniset $GLANCE_API_CONF DEFAULT container_formats "ami,ari,aki,bare,ovf,tgz"
         iniset $GLANCE_API_CONF DEFAULT disk_formats "ami,ari,aki,vhd,raw,iso"
diff --git a/lib/heat b/lib/heat
index a088e82886..d713f18269 100644
--- a/lib/heat
+++ b/lib/heat
@@ -105,7 +105,7 @@ function configure_heat {
     cp $HEAT_DIR/etc/heat/policy.json $HEAT_POLICY_FILE
 
     # common options
-    iniset_rpc_backend heat $HEAT_CONF DEFAULT
+    iniset_rpc_backend heat $HEAT_CONF
     iniset $HEAT_CONF DEFAULT heat_metadata_server_url http://$HEAT_API_CFN_HOST:$HEAT_API_CFN_PORT
     iniset $HEAT_CONF DEFAULT heat_waitcondition_server_url http://$HEAT_API_CFN_HOST:$HEAT_API_CFN_PORT/v1/waitcondition
     iniset $HEAT_CONF DEFAULT heat_watch_server_url http://$HEAT_API_CW_HOST:$HEAT_API_CW_PORT
diff --git a/lib/ironic b/lib/ironic
index 35b5411cd4..2dc95bb435 100644
--- a/lib/ironic
+++ b/lib/ironic
@@ -313,7 +313,7 @@ function configure_ironic_api {
     iniset $IRONIC_CONF_FILE keystone_authtoken cafile $SSL_BUNDLE_FILE
     iniset $IRONIC_CONF_FILE keystone_authtoken signing_dir $IRONIC_AUTH_CACHE_DIR/api
 
-    iniset_rpc_backend ironic $IRONIC_CONF_FILE DEFAULT
+    iniset_rpc_backend ironic $IRONIC_CONF_FILE
     iniset $IRONIC_CONF_FILE api port $IRONIC_SERVICE_PORT
 
     cp -p $IRONIC_DIR/etc/ironic/policy.json $IRONIC_POLICY_JSON
diff --git a/lib/keystone b/lib/keystone
index c9433d98fe..89e9aa1918 100644
--- a/lib/keystone
+++ b/lib/keystone
@@ -226,7 +226,7 @@ function configure_keystone {
         iniset $KEYSTONE_CONF assignment driver "keystone.assignment.backends.$KEYSTONE_ASSIGNMENT_BACKEND.Assignment"
     fi
 
-    iniset_rpc_backend keystone $KEYSTONE_CONF DEFAULT
+    iniset_rpc_backend keystone $KEYSTONE_CONF
 
     # Set the URL advertised in the ``versions`` structure returned by the '/' route
     if is_service_enabled tls-proxy; then
diff --git a/lib/neutron b/lib/neutron
index e41abafda9..a31a064063 100755
--- a/lib/neutron
+++ b/lib/neutron
@@ -422,7 +422,7 @@ function is_neutron_enabled {
 # Set common config for all neutron server and agents.
 function configure_neutron {
     _configure_neutron_common
-    iniset_rpc_backend neutron $NEUTRON_CONF DEFAULT
+    iniset_rpc_backend neutron $NEUTRON_CONF
 
     # goes before q-svc to init Q_SERVICE_PLUGIN_CLASSES
     if is_service_enabled q-lbaas; then
diff --git a/lib/nova b/lib/nova
index 199daeea3d..f0490951b7 100644
--- a/lib/nova
+++ b/lib/nova
@@ -537,7 +537,7 @@ function create_nova_conf {
 
     iniset $NOVA_CONF DEFAULT ec2_dmz_host "$EC2_DMZ_HOST"
     iniset $NOVA_CONF DEFAULT keystone_ec2_url $KEYSTONE_SERVICE_PROTOCOL://$KEYSTONE_SERVICE_HOST:$KEYSTONE_SERVICE_PORT/v2.0/ec2tokens
-    iniset_rpc_backend nova $NOVA_CONF DEFAULT
+    iniset_rpc_backend nova $NOVA_CONF
     iniset $NOVA_CONF glance api_servers "${GLANCE_SERVICE_PROTOCOL}://${GLANCE_HOSTPORT}"
 
     iniset $NOVA_CONF DEFAULT osapi_compute_workers "$API_WORKERS"
diff --git a/lib/rpc_backend b/lib/rpc_backend
index ff22bbf8fa..32c3e17aa3 100644
--- a/lib/rpc_backend
+++ b/lib/rpc_backend
@@ -237,7 +237,7 @@ function restart_rpc_backend {
 function iniset_rpc_backend {
     local package=$1
     local file=$2
-    local section=$3
+    local section=${3:-DEFAULT}
     if is_service_enabled zeromq; then
         iniset $file $section rpc_backend "zmq"
         iniset $file $section rpc_zmq_host `hostname`
diff --git a/lib/sahara b/lib/sahara
index 521b19a4a1..7c22d0f5b9 100644
--- a/lib/sahara
+++ b/lib/sahara
@@ -127,7 +127,7 @@ function configure_sahara {
     if is_service_enabled ceilometer; then
         iniset $SAHARA_CONF_FILE DEFAULT enable_notifications "true"
         iniset $SAHARA_CONF_FILE DEFAULT notification_driver "messaging"
-        iniset_rpc_backend sahara $SAHARA_CONF_FILE DEFAULT
+        iniset_rpc_backend sahara $SAHARA_CONF_FILE
     fi
 
     iniset $SAHARA_CONF_FILE DEFAULT verbose True
diff --git a/lib/zaqar b/lib/zaqar
index 79b4c5a2ca..02b69879fe 100644
--- a/lib/zaqar
+++ b/lib/zaqar
@@ -133,7 +133,7 @@ function configure_zaqar {
         iniset $ZAQAR_CONF DEFAULT notification_driver messaging
         iniset $ZAQAR_CONF DEFAULT control_exchange zaqar
     fi
-    iniset_rpc_backend zaqar $ZAQAR_CONF DEFAULT
+    iniset_rpc_backend zaqar $ZAQAR_CONF
 
     cleanup_zaqar
 }