diff --git a/files/lib/blue-merle/mac-wipe.sh b/files/lib/blue-merle/mac-wipe.sh
index b32ce58..29a3fba 100644
--- a/files/lib/blue-merle/mac-wipe.sh
+++ b/files/lib/blue-merle/mac-wipe.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env ash
 
-# This script wipes all MAC address data from the device and is called upon boot
+# This script ensures that MAC addresses are stored on volatile memory rather than flash
 
 tmpdir="$(mktemp -d)"
 # We mount a tmpfs so that the client database will be stored in memory only
@@ -8,6 +8,8 @@ mount -t tmpfs / "$tmpdir"
 /etc/init.d/gl-tertf stop
 cp -a /etc/oui-tertf/client.db "$tmpdir"
 shred /etc/oui-tertf/client.db ||  rm -f /etc/oui-tertf/client.db
+# If this script runs multiple times, we accumulate mounts; we try to avoid having mounts over mounts, so we unmount any existing tmpfs
+umount -t tmpfs -l /etc/oui-tertf
 
 mount -t tmpfs / /etc/oui-tertf
 cp -a "$tmpdir/client.db" /etc/oui-tertf/client.db