diff --git a/src/tests/test_process.py b/src/tests/test_process.py
index 4100514e..e9bd77d8 100644
--- a/src/tests/test_process.py
+++ b/src/tests/test_process.py
@@ -48,6 +48,7 @@ class TestProcessProto(unittest.TestCase):
             for setting in cls._settings.iteritems():
                 config.set('bitmessagesettings', *setting)
             config.save()
+            put_signal_file(cls.home, 'unittest.lock')
             cls._start_process()
 
     @classmethod