diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index b1a6dac..533f65d 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -5662,7 +5662,7 @@
 	var PCUIF_send_data sd;
 
 	[] PCU.receive(t_SD_PCUIF(pcu_conn_id, tr_PCUIF_INFO_IND(bts_nr, ?))) -> value sd {
-		var bitstring pdch_mask := f_PCUIF_ver_INFO_PDCHMask_get(sd.data.u.info_ind, trx_nr);
+		var BIT8 pdch_mask := f_PCUIF_ver_INFO_PDCHMask_get(sd.data.u.info_ind, trx_nr);
 		if (substr(pdch_mask, g_chan_nr.tn, 1) != exp) {
 			repeat;
 		}