diff --git a/tests/test_main.py b/tests/test_main.py
index 29578f7..f047e2c 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -48,4 +48,5 @@
         tests = loader.loadTestsFromNames(test_modules)
 
     test_runner = unittest.runner.TextTestRunner()
-    test_runner.run(tests)
+    result = test_runner.run(tests)
+    sys.exit(not result.wasSuccessful())