diff --git a/board/czechlight/clearfog/sdn-roadm-line-clearfog.dts b/board/czechlight/clearfog/sdn-roadm-line-clearfog.dts
index ca833c6..4fe1931 100644
--- a/board/czechlight/clearfog/sdn-roadm-line-clearfog.dts
+++ b/board/czechlight/clearfog/sdn-roadm-line-clearfog.dts
@@ -1,2 +1,3 @@
+#define CLEARFOG_REV1
 #include "sdn-roadm-clearfog.dtsi"
 #include "clearfog-output-voa.dtsi"