diff --git a/demos/tests/run_tests.py b/demos/tests/run_tests.py
index e05391cd379..079af98de3c 100755
--- a/demos/tests/run_tests.py
+++ b/demos/tests/run_tests.py
@@ -338,8 +338,7 @@ def option_to_args(key, value):
                                 exit_msg = f'Exit code: {e.returncode}\n'
                             elif isinstance(e, subprocess.TimeoutExpired):
                                 exit_msg = f'Command timed out after {e.timeout} seconds\n'
-                            output += exit_msg
-                            print(output)
+                            print('{}\n{}'.format(output, exit_msg))
                             failed_tests.append(test_descr + '\n' + exit_msg)
                             num_failures += 1
                             execution_time = -1