diff --git a/files/lib/blue-merle/mac-wipe.sh b/files/lib/blue-merle/mac-wipe.sh
index 631339b..b32ce58 100644
--- a/files/lib/blue-merle/mac-wipe.sh
+++ b/files/lib/blue-merle/mac-wipe.sh
@@ -2,10 +2,17 @@
 
 # This script wipes all MAC address data from the device and is called upon boot
 
-/etc/init.d/gl-tertf stop
-shred /etc/oui-tertf/client.db ||  rm -f /etc/oui-tertf/client.db
+tmpdir="$(mktemp -d)"
 # We mount a tmpfs so that the client database will be stored in memory only
+mount -t tmpfs / "$tmpdir"
+/etc/init.d/gl-tertf stop
+cp -a /etc/oui-tertf/client.db "$tmpdir"
+shred /etc/oui-tertf/client.db ||  rm -f /etc/oui-tertf/client.db
+
 mount -t tmpfs / /etc/oui-tertf
+cp -a "$tmpdir/client.db" /etc/oui-tertf/client.db
+umount -t tmpfs -l "$tmpdir"
+
 logger -p notice -t blue-merle-mac-wipe "Restarting tertf..."
 /etc/init.d/gl-tertf start
 logger -p notice -t blue-merle-mac-wipe "... Finished"