diff --git a/audio/test/low_bandwidth_audio_test.py b/audio/test/low_bandwidth_audio_test.py
index 386572f6e5..051d67fea4 100755
--- a/audio/test/low_bandwidth_audio_test.py
+++ b/audio/test/low_bandwidth_audio_test.py
@@ -296,9 +296,6 @@ def main():
   else:
     test_command = [os.path.join(args.build_dir, 'low_bandwidth_audio_test')]
 
-  if args.isolated_script_test_output:
-    test_command += ['--gtest_output=json:' + args.isolated_script_test_output]
-
   analyzers = [Analyzer('pesq', _RunPesq, pesq_path, 16000)]
   # Check if POLQA can run at all, or skip the 48 kHz tests entirely.
   example_path = os.path.join(SRC_DIR, 'resources', 'voice_engine',
@@ -366,6 +363,10 @@ def main():
     with open(args.isolated_script_test_perf_output, 'wb') as f:
       f.write(histograms.AsProto().SerializeToString())
 
+  if args.isolated_script_test_output:
+    with open(args.isolated_script_test_output, 'w') as f:
+      json.dump({"version": 3}, f)
+
   return test_process.wait()
 
 
diff --git a/tools_webrtc/flags_compatibility.py b/tools_webrtc/flags_compatibility.py
index e7aeb93faf..72c66a594f 100755
--- a/tools_webrtc/flags_compatibility.py
+++ b/tools_webrtc/flags_compatibility.py
@@ -22,7 +22,9 @@ def main():
 
   test_command = _ForcePythonInterpreter(unrecognized_args)
   if args.isolated_script_test_output:
-    test_command += ['--gtest_output=json:' + args.isolated_script_test_output]
+    test_command += [
+        '--isolated_script_test_output', args.isolated_script_test_output
+    ]
   if args.isolated_script_test_perf_output:
     test_command += [
         '--isolated_script_test_perf_output=' +