diff --git a/lib/neutron_plugins/ml2 b/lib/neutron_plugins/ml2
index ace5335..30e1b03 100644
--- a/lib/neutron_plugins/ml2
+++ b/lib/neutron_plugins/ml2
@@ -4,7 +4,7 @@
 # ------------------------------
 
 # Save trace setting
-ML2_XTRACE=$(set +o | grep xtrace)
+_XTRACE_NEUTRON_ML2=$(set +o | grep xtrace)
 set +o xtrace
 
 # Enable this to simply and quickly enable tunneling with ML2.
@@ -137,4 +137,4 @@
 }
 
 # Restore xtrace
-$ML2_XTRACE
+$_XTRACE_NEUTRON_ML2