diff --git a/tests/renderer/utils.py b/tests/renderer/utils.py
index 0326d902901d8791ba296c3b64eb7bbce5fe7a09..13e449bc1cfa3ab06e132c2ec1925ab24dc7cf1c 100644
--- a/tests/renderer/utils.py
+++ b/tests/renderer/utils.py
@@ -347,7 +347,7 @@ def run_renderer(
                     cmd2[10] = str(sr)
                     cmd2[0] += BIN_SUFFIX_MERGETARGET # Use IVAS_rend_ref for re-rendering
                     cmd2[0] += binary_suffix
-                    if "MASA" in out_fmt:
+                    if "MASA" in str(out_fmt):
                         cmd2.extend(["-im", out_file + ".met"])
                     run_cmd(cmd2, env)