diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index ae2d2e0a4..aa0618028 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -3566,7 +3566,7 @@ private function f_TC_imm_ass(integer num_total, float sleep_s, float exp_pass)
 	f_l1_tune(L1CTL);
 
 	for (var integer i := 0; i < num_total; i := i+1) {
-		var ChannelDescription ch_desc := valueof(ts_ChanDescH0(t_RslChanNr_SDCCH4(0, 0), mp_trx0_arfcn));
+		var ChannelDescription ch_desc := valueof(ts_ChanDescH0(ts_RslChanNr_SDCCH4(0, 0), mp_trx0_arfcn));
 		var GsmRrMessage ia := valueof(ts_IMM_ASS(42, i, 5, ch_desc, c_MA_null));
 		var octetstring ia_enc := enc_GsmRrMessage(ia);
 		RSL_CCHAN.send(ts_ASP_RSL_UD(ts_RSL_IMM_ASSIGN(ia_enc, 0)));