diff --git a/pcu/PCU_Tests.ttcn b/pcu/PCU_Tests.ttcn
index 9388f8f..343af34 100644
--- a/pcu/PCU_Tests.ttcn
+++ b/pcu/PCU_Tests.ttcn
@@ -1875,6 +1875,12 @@
 	/* Initialize the PCU interface abstraction */
 	f_init_raw(testcasename());
 
+	/* Disable "idle DL TBF alive" timer, to make the test easier and avoid
+	 * having to keep receiving dummy LLC blocks for a while until the last
+	 * block with FBI=1 is set. This way the first and only DL block is already
+	 * the FBI one. */
+	f_vty_config2(PCUVTY, {"pcu"}, "timer X2031 0");
+
 	/* Establish BSSGP connection to the PCU */
 	f_bssgp_establish();
 	f_bssgp_client_llgmm_assign(TLLI_UNUSED, ms.tlli);
@@ -1886,6 +1892,10 @@
 	/* Wait timer X2002 and DL block is available after CCCH IMM ASS: */
 	f_sleep(X2002);
 	f_rx_rlcmac_dl_block_exp_data(dl_block, dl_fn, data, 0);
+	if (dl_block.data.mac_hdr.hdr_ext.fbi == false) {
+		setverdict(fail, "Expected DL data block with FBI=1 but got FBI=0");
+		f_shutdown(__BFILE__, __LINE__);
+	}
 
 	/* ACK the DL block */
 	f_acknackdesc_ack_block(ms.dl_tbf.acknack_desc, dl_block, '1'B);