diff --git a/tests/codec_be_on_mr_nonselection/test_param_file.py b/tests/codec_be_on_mr_nonselection/test_param_file.py
index 619e25276734d59b4da909b556358a3020fc817b..eee9fcd9b274eaadbff8e1c21f222ca397a04458 100644
--- a/tests/codec_be_on_mr_nonselection/test_param_file.py
+++ b/tests/codec_be_on_mr_nonselection/test_param_file.py
@@ -330,8 +330,8 @@ def test_param_file_tests(
             ref_tracefile_dec = f"{reference_path}/param_file/dec/{tracefile_dec}"
 
             # check for same RTP sequence number in last line of tracefile
-            dut_rtp_num_last = np.genfromtxt(dut_tracefile_dec, delimiter=";")[-1,0]
-            ref_rtp_num_last = np.genfromtxt(ref_tracefile_dec, delimiter=";")[-1,0]
+            dut_rtp_num_last = np.genfromtxt(dut_tracefile_dec, delimiter=";", usecols=[0])[-1]
+            ref_rtp_num_last = np.genfromtxt(ref_tracefile_dec, delimiter=";", usecols=[0])[-1]
             tracefile_last_rtp_numbers_differ = dut_rtp_num_last != ref_rtp_num_last
 
         # same sequence number -> likely no crash, assume length difference is due to difference in TSM