diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index 0ac8674..0c400fd 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -422,6 +422,9 @@
 
 	unsigned int num_bts;
 	struct llist_head bts_list;
+
+	/* timer values */
+	int T3101;
 };
 
 #define SMS_HDR_SIZE	128