diff --git a/lib/nova_plugins/functions-libvirt b/lib/nova_plugins/functions-libvirt
index 045fc8b..dae55c6 100644
--- a/lib/nova_plugins/functions-libvirt
+++ b/lib/nova_plugins/functions-libvirt
@@ -8,7 +8,7 @@
 # ``STACK_USER`` has to be defined
 
 # Save trace setting
-LV_XTRACE=$(set +o | grep xtrace)
+_XTRACE_NOVA_FN_LIBVIRT=$(set +o | grep xtrace)
 set +o xtrace
 
 # Defaults
@@ -134,7 +134,7 @@
 
 
 # Restore xtrace
-$LV_XTRACE
+$_XTRACE_NOVA_FN_LIBVIRT
 
 # Local variables:
 # mode: shell-script