diff --git a/include/osmocom/gsm/protocol/gsm_12_21.h b/include/osmocom/gsm/protocol/gsm_12_21.h
index 6156ce9..542d978 100644
--- a/include/osmocom/gsm/protocol/gsm_12_21.h
+++ b/include/osmocom/gsm/protocol/gsm_12_21.h
@@ -564,8 +564,10 @@
 	NM_CHANC_IPAC_TCHFull_PDCH = 0x80,
 	NM_CHANC_IPAC_TCHFull_TCHHalf = 0x81,
 	/* osmocom */
-	NM_CHANC_OSMO_TCHFull_TCHHalf_PDCH = 0x90,
+	NM_CHANC_OSMO_DYN = 0x90,
 };
+/* Backward compatibility with older naming: */
+#define NM_CHANC_OSMO_TCHFull_TCHHalf_PDCH NM_CHANC_OSMO_DYN
 
 /*! Event Type (Section 9.4.16) */
 enum abis_nm_event_type {