diff --git a/tools/genenv b/tools/genenv
index d5fff2cc4e..f4551e6dbf 100755
--- a/tools/genenv
+++ b/tools/genenv
@@ -165,7 +165,7 @@ NOVA_EC2_API_SERVICE_HOST=$NOVA_EC2_SERVICE_HOST
 NOVA_EC2_SERVICE_HOST=$NOVA_EC2_SERVICE_HOST
 NOVA_KEYSTONE_PASSWORD=$NOVA_KEYSTONE_PASSWORD
 NOVA_KEYSTONE_USER=$NOVA_KEYSTONE_USER
-NEUTRON_SHARED_SECRET:=$NEUTRON_SHARED_SECRET
+NEUTRON_SHARED_SECRET=$NEUTRON_SHARED_SECRET
 NEUTRON_DB_NAME=$NEUTRON_DB_NAME
 NEUTRON_DB_USER=$NEUTRON_DB_USER
 NEUTRON_DB_PASSWORD=$NEUTRON_DB_PASSWORD