diff --git a/openbsc/include/openbsc/gsm_data_shared.h b/openbsc/include/openbsc/gsm_data_shared.h
index f3a8c32..8743c80 100644
--- a/openbsc/include/openbsc/gsm_data_shared.h
+++ b/openbsc/include/openbsc/gsm_data_shared.h
@@ -348,6 +348,12 @@
 
 	enum gsm_phys_chan_config pchan;
 
+	struct {
+		enum gsm_phys_chan_config pchan_is;
+		enum gsm_phys_chan_config pchan_want;
+		struct msgb *pending_chan_activ;
+	} dyn;
+
 	unsigned int flags;
 	struct gsm_abis_mo mo;
 	struct tlv_parsed nm_attr;
diff --git a/openbsc/src/libcommon/gsm_data_shared.c b/openbsc/src/libcommon/gsm_data_shared.c
index 1c4ade2..8264e42 100644
--- a/openbsc/src/libcommon/gsm_data_shared.c
+++ b/openbsc/src/libcommon/gsm_data_shared.c
@@ -169,6 +169,8 @@
 		ts->trx = trx;
 		ts->nr = k;
 		ts->pchan = GSM_PCHAN_NONE;
+		ts->dyn.pchan_is = GSM_PCHAN_NONE;
+		ts->dyn.pchan_want = GSM_PCHAN_NONE;
 		ts->tsc = -1;
 
 		gsm_mo_init(&ts->mo, bts, NM_OC_CHANNEL,