diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index 79d0f63..314d2d9 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -2408,7 +2408,7 @@
 
 	ws_check(dl_tbf, __func__, 1, 128 + 1 * 64, false);
 
-	dl_tbf->update();
+	OSMO_ASSERT(dl_tbf_upgrade_to_multislot(dl_tbf) == 0);
 
 	/* window size should be 384 */
 	ws_check(dl_tbf, __func__, 4, 128 + 4 * 64, true);
diff --git a/tests/tbf/TbfTest.err b/tests/tbf/TbfTest.err
index 2606b01..048e03e 100644
--- a/tests/tbf/TbfTest.err
+++ b/tests/tbf/TbfTest.err
@@ -7146,7 +7146,7 @@
 TBF(DL:TFI-0-0-0:STATE-NEW:EGPRS) setting EGPRS DL window size to 192, base(128) slots(1) ws_pdch(64)
 ws(192)
 DL TBF slots: 0x10, N: 1, WS: 192
-********** DL-TBF update **********
+TBF(DL:TFI-0-0-0:STATE-NEW:EGPRS) Upgrade to multislot
 PDCH(bts=0,trx=0,ts=4) Detaching TBF(DL:TFI-0-0-0:STATE-NEW:EGPRS), 1 TBFs, USFs = 00, TFIs = 00000001.
 [DL] algo B <multi> (suggested TRX: -1): Alloc start
 Found first unallocated TRX=0 TFI=0