diff --git a/tests/test_param_file.py b/tests/test_param_file.py
index 7774d5940344f037936ad68799de5d5924ef10c0..fbdf57ff3aa434ea5b0a0d0f9259f559251cbc0d 100644
--- a/tests/test_param_file.py
+++ b/tests/test_param_file.py
@@ -266,11 +266,7 @@ def test_param_file_tests(
 
     # the output file is not the real output filename
     # -> construct output filename
-    if output_config != "":
-        output_file = f"{testv_base}_{tag_str}.dec.{output_config_name}.pcm"
-    else:
-        # EVS decoder command lines do not have an output_config: use "MONO" in the output filename
-        output_file = f"{testv_base}_{tag_str}.dec.MONO.pcm"
+    output_file = f"{testv_base}_{tag_str}.dec.wav"
 
     decode(
         dut_decoder_frontend,