diff --git a/privacyidea/Makefile b/privacyidea/Makefile
index 0e9fc14..6dc05dd 100644
--- a/privacyidea/Makefile
+++ b/privacyidea/Makefile
@@ -60,6 +60,9 @@ postinstall: timesyncd.conf installgrub.sh grub.shell firstboot.start
 	cp freeradius/privacyidea $(CHROOT)/etc/raddb/sites-available/
 	$(inroot) chown root:radius /etc/raddb/sites-available/privacyidea
 	chmod 640 $(CHROOT)/etc/raddb/sites-available/privacyidea
+	cp freeradius/dictionary.netknights $(CHROOT)/etc/raddb/dictionary
+	$(inroot) chown root:radius /etc/raddb/dictionary
+	chmod 640 $(CHROOT)/etc/raddb/dictionary
 	rm $(CHROOT)/etc/raddb/mods-enabled/eap
 	rm $(CHROOT)/etc/raddb/sites-enabled/*
 	ln -s ../sites-available/privacyidea $(CHROOT)/etc/raddb/sites-enabled/privacyidea
diff --git a/privacyidea/freeradius/dictionary.netknights b/privacyidea/freeradius/dictionary.netknights
new file mode 100644
index 0000000..483e66a
--- /dev/null
+++ b/privacyidea/freeradius/dictionary.netknights
@@ -0,0 +1,13 @@
+# -*- text -*-
+#
+# 	privacyIDEA dictionary
+#
+
+VENDOR		NetKnights			44929
+
+#  Backwards compatibility.
+BEGIN-VENDOR	NetKnights
+
+ATTRIBUTE	privacyIDEA-Serial					1	string
+
+END-VENDOR	NetKnights