diff --git a/mobly/test_runner.py b/mobly/test_runner.py
index b32f5b0f..15c44d30 100644
--- a/mobly/test_runner.py
+++ b/mobly/test_runner.py
@@ -79,7 +79,7 @@ def main(argv=None):
         runner.run()
         ok = runner.results.is_all_pass and ok
       except signals.TestAbortAll:
-        pass
+        ok = False
       except Exception:
         logging.exception('Exception when executing %s.', config.testbed_name)
         ok = False
diff --git a/tests/mobly/test_runner_test.py b/tests/mobly/test_runner_test.py
index 0bdf5126..401f2ed7 100755
--- a/tests/mobly/test_runner_test.py
+++ b/tests/mobly/test_runner_test.py
@@ -335,6 +335,25 @@ def test_main_parse_args(self, mock_test_runner, mock_config, mock_find_test):
     test_runner.main(['-c', 'some/path/foo.yaml', '-b', 'hello'])
     mock_config.assert_called_with('some/path/foo.yaml', None)
 
+  @mock.patch(
+      'mobly.test_runner._find_test_class',
+      return_value=type('SampleTest', (), {}),
+  )
+  @mock.patch(
+      'mobly.test_runner.config_parser.load_test_config_file',
+      return_value=[config_parser.TestRunConfig()],
+  )
+  @mock.patch('mobly.test_runner.TestRunner')
+  @mock.patch('sys.exit')
+  def test_main_with_abort_all(
+      self, mock_exit, mock_test_runner_class, mock_config, mock_find_test
+  ):
+    mock_runner = mock.MagicMock()
+    mock_runner.run.side_effect = signals.TestAbortAll('Aborting all tests.')
+    mock_test_runner_class.return_value = mock_runner
+    test_runner.main(['-c', 'some/path/foo.yaml'])
+    mock_exit.assert_called_once_with(1)
+
   @mock.patch(
       'mobly.test_runner._find_test_class',
       return_value=integration_test.IntegrationTest,