diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 8379fba..49e5fa1 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -2762,7 +2762,9 @@
 	f_init_pcu(PCU, id, pcu_conn_id, first_info);
 
 	f_dyn_osmo_pdch_act(pcu_conn_id, bts_nr, trx_nr);
-	f_dyn_osmo_pdch_act(pcu_conn_id, bts_nr, trx_nr);
+	/* Send a second Chan Activ and expect it to be NACKed */
+	f_rsl_transceive(ts_RSL_CHAN_ACT(g_chan_nr, g_pars.chan_mode), tr_RSL_CHAN_ACT_NACK(g_chan_nr),
+			 "RSL CHAN ACT NACK");
 	setverdict(pass);
 }
 testcase TC_dyn_osmo_pdch_double_act() runs on test_CT {