diff --git a/src/libcommon/gsm_data_shared.c b/src/libcommon/gsm_data_shared.c
index d792f3b..2696273 100644
--- a/src/libcommon/gsm_data_shared.c
+++ b/src/libcommon/gsm_data_shared.c
@@ -644,11 +644,14 @@
 
 	switch (pchan) {
 	case GSM_PCHAN_TCH_F:
-	case GSM_PCHAN_PDCH:
 	case GSM_PCHAN_TCH_F_PDCH:
 		OSMO_ASSERT(lchan_nr == 0);
 		cbits = 0x01;
 		break;
+	case GSM_PCHAN_PDCH:
+		OSMO_ASSERT(lchan_nr == 0);
+		cbits = RSL_CHAN_OSMO_PDCH >> 3;
+		break;
 	case GSM_PCHAN_TCH_H:
 		OSMO_ASSERT(lchan_nr < 2);
 		cbits = 0x02;