diff --git a/debian/wit-network-config.postinst b/debian/wit-network-config.postinst
index 5e0a2fa..2934031 100755
--- a/debian/wit-network-config.postinst
+++ b/debian/wit-network-config.postinst
@@ -111,7 +111,7 @@ case "$1" in
           do
             ifmac=${MACS[$if]}
             [ "$if" == "mgmt" ] && if=mgmt1
-            [ -z "$ifmac" ] || echo 'SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=='$mac', ATTR{type}=="1", NAME="'${if}'"'
+            [ -z "$ifmac" ] || echo 'SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=='$ifmac', ATTR{type}=="1", NAME="'${if}'"'
         done >/etc/udev/rules.d/70-persistent-net.rules