diff --git a/keystone/tests/unit/token/test_fernet_provider.py b/keystone/tests/unit/token/test_fernet_provider.py
index b0d5238e9b..7b784a9378 100644
--- a/keystone/tests/unit/token/test_fernet_provider.py
+++ b/keystone/tests/unit/token/test_fernet_provider.py
@@ -695,9 +695,11 @@ class TestFernetKeyRotation(unit.TestCase):
 
 class TestLoadKeys(unit.TestCase):
 
-    def assertValidFernetKey(self, keys):
-        self.assertGreater(len(keys[0]), 0)
-        self.assertIsInstance(keys[0], str)
+    def assertValidFernetKeys(self, keys):
+        # Make sure each key is a non-empty string
+        for key in keys:
+            self.assertGreater(len(key), 0)
+            self.assertIsInstance(key, str)
 
     def test_non_numeric_files(self):
         self.useFixture(
@@ -717,4 +719,4 @@ class TestLoadKeys(unit.TestCase):
         )
         keys = key_utils.load_keys()
         self.assertEqual(2, len(keys))
-        self.assertValidFernetKey(keys)
+        self.assertValidFernetKeys(keys)