diff --git a/tests/test_sparkpost_integration.py b/tests/test_sparkpost_integration.py
index f9737c2..bdf8a8f 100644
--- a/tests/test_sparkpost_integration.py
+++ b/tests/test_sparkpost_integration.py
@@ -129,4 +129,4 @@ class SparkPostBackendIntegrationTests(AnymailTestMixin, SimpleTestCase):
         err = cm.exception
         self.assertEqual(err.status_code, 401)
         # Make sure the exception message includes SparkPost's response:
-        self.assertIn("Forbidden", str(err))
+        self.assertIn("Unauthorized", str(err))