diff --git a/lib/c/2014/labcomm_private.h b/lib/c/2014/labcomm_private.h
index 95900fe29b81cc282494628737300ba0694d8247..8ed93ce02c11d33e423be5332481eae6fa6360b2 100644
--- a/lib/c/2014/labcomm_private.h
+++ b/lib/c/2014/labcomm_private.h
@@ -64,6 +64,7 @@
 #define LABCOMM_FLOAT        0x25
 #define LABCOMM_DOUBLE       0x26
 #define LABCOMM_STRING       0x27
+#define LABCOMM_REF          0x28
 
 
 /*