diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 8f245c9..5794617 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -1185,6 +1185,7 @@
 #define GSM_T3119_DEFAULT 10
 #define GSM_T3122_DEFAULT 10
 #define GSM_T3141_DEFAULT 10
+#define GSM_T10_DEFAULT 6	/* RR Assignment timeout, in seconds */
 #define GSM_T7_DEFAULT 10	/* inter-BSC MO Handover first timeout, in seconds */
 #define GSM_T8_DEFAULT 10	/* inter-BSC MO Handover second timeout, in seconds */
 #define GSM_T101_DEFAULT 10	/* inter-BSC MT Handover timeout, in seconds */
@@ -1233,6 +1234,7 @@
 	int T3119;
 	int T3122;
 	int T3141;
+	int T10; /*< RR Assignment timeout, in seconds */
 	int T7; /*< inter-BSC handover MO timeout from Handover Required to Handover Command */
 	int T8; /*< inter-BSC handover MO timeout from Handover Command to final Clear*/
 	int T101; /*< inter-BSC handover MT timeout from Handover Request to Handover Accept */