diff --git a/lib/tempest b/lib/tempest
index 79412f9..8681c45 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -64,6 +64,7 @@
 
 # Neutron/Network variables
 IPV6_ENABLED=$(trueorfalse True $IPV6_ENABLED)
+IPV6_SUBNET_ATTRIBUTES_ENABLED=$(trueorfalse True $IPV6_SUBNET_ATTRIBUTES_ENABLED)
 
 # Functions
 # ---------