diff -r 5880b4e762cd -r b58d608ec6a0 tests/test-lock.py
--- a/tests/test-lock.py	Wed Jan 30 16:53:12 2019 -0800
+++ b/tests/test-lock.py	Wed Jan 30 16:54:34 2019 -0800
@@ -290,7 +290,7 @@
             self.fail("unexpected lock acquisition")
         except error.LockHeld as why:
             self.assertTrue(why.errno == errno.ETIMEDOUT)
-            self.assertTrue(why.locker == "")
+            self.assertTrue(why.locker == b"")
             state.assertlockexists(False)
 
 if __name__ == '__main__':