diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index 18ad3ff..7907734 100644
--- a/include/osmocom/core/logging.h
+++ b/include/osmocom/core/logging.h
@@ -136,7 +136,8 @@
 #define DLBSSGP		-21	/*!< Osmocom BSSGP layer */
 #define DLNSDATA	-22	/*!< Osmocom NS layer data pdus */
 #define DLNSSIGNAL	-23	/*!< Osmocom NS layer signal pdus */
-#define OSMO_NUM_DLIB	23	/*!< Number of logging sub-systems in libraries */
+#define DLIUUP		-24	/*!< Osmocom IuUP layer */
+#define OSMO_NUM_DLIB	24	/*!< Number of logging sub-systems in libraries */
 
 /* Colors that can be used in log_info_cat.color */
 #define OSMO_LOGCOLOR_NORMAL NULL