diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index 99686b9e..c9b01dbc 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -76,12 +76,14 @@ static void test_tbf_tlli_update()
 	gprs_rlcmac_tbf *dl_tbf = tbf_alloc_dl_tbf(the_bts.bts_data(),
 						NULL, 0,
 						0, 0, 0);
+	OSMO_ASSERT(dl_tbf != NULL);
 	dl_tbf->update_ms(0x2342, GPRS_RLCMAC_DL_TBF);
 	dl_tbf->set_ta(4);
 
 	gprs_rlcmac_tbf *ul_tbf = tbf_alloc_ul_tbf(the_bts.bts_data(),
 						dl_tbf->ms(), 0,
 						0, 0, 0);
+	OSMO_ASSERT(ul_tbf != NULL);
 	ul_tbf->update_ms(0x2342, GPRS_RLCMAC_UL_TBF);
 
 	ms = the_bts.ms_by_tlli(0x2342);