diff --git a/include/osmocom/core/stat_item.h b/include/osmocom/core/stat_item.h
index c1466f8..b3a3d9c 100644
--- a/include/osmocom/core/stat_item.h
+++ b/include/osmocom/core/stat_item.h
@@ -13,6 +13,7 @@
 struct osmo_stat_item_desc;
 
 #define STAT_ITEM_NOVALUE_ID 0
+#define OSMO_STAT_ITEM_NO_UNIT NULL
 
 struct osmo_stat_item_value {
 	int32_t id;