diff --git a/devstack/lib/tacker b/devstack/lib/tacker
index 5a443ab5f..a699817b2 100644
--- a/devstack/lib/tacker
+++ b/devstack/lib/tacker
@@ -245,7 +245,7 @@ function configure_tacker {
 
         # Experimental settings for monitor alarm auth settings,
         # Will be changed according to new implementation.
-        iniset $TACKER_CONF alarm_auth uername tacker
+        iniset $TACKER_CONF alarm_auth username tacker
         iniset $TACKER_CONF alarm_auth password "$SERVICE_PASSWORD"
         iniset $TACKER_CONF alarm_auth project_name "$SERVICE_PROJECT_NAME"
         iniset $TACKER_CONF alarm_auth url http://$SERVICE_HOST:35357/v3