diff --git a/lib/nova_plugins/hypervisor-libvirt b/lib/nova_plugins/hypervisor-libvirt
index c54a716..8bbaa21 100644
--- a/lib/nova_plugins/hypervisor-libvirt
+++ b/lib/nova_plugins/hypervisor-libvirt
@@ -17,7 +17,7 @@
 # cleanup_nova_hypervisor - remove transient data and cache
 
 # Save trace setting
-MY_XTRACE=$(set +o | grep xtrace)
+_XTRACE_NOVA_LIBVIRT=$(set +o | grep xtrace)
 set +o xtrace
 
 source $TOP_DIR/lib/nova_plugins/functions-libvirt
@@ -105,7 +105,7 @@
 
 
 # Restore xtrace
-$MY_XTRACE
+$_XTRACE_NOVA_LIBVIRT
 
 # Local variables:
 # mode: shell-script