diff --git a/workers/servicekeyworker/servicekeyworker.py b/workers/servicekeyworker/servicekeyworker.py
index adbcf5465..8539699a0 100644
--- a/workers/servicekeyworker/servicekeyworker.py
+++ b/workers/servicekeyworker/servicekeyworker.py
@@ -10,12 +10,12 @@ logger = logging.getLogger(__name__)
 class ServiceKeyWorker(Worker):
   def __init__(self):
     super(ServiceKeyWorker, self).__init__()
-    self.add_operation(self._refresh_service_keys,
+    self.add_operation(self._refresh_service_key,
                        app.config.get('INSTANCE_SERVICE_KEY_REFRESH', 60)*60)
 
-  def _refresh_service_keys(self):
+  def _refresh_service_key(self):
     """
-    Refreshes active service keys so they don't get garbage collected.
+    Refreshes the instance's active service key so it doesn't get garbage collected.
     """
     expiration = timedelta(minutes=instance_keys.service_key_expiration)
     logger.debug('Starting refresh of automatic service keys')
diff --git a/workers/servicekeyworker/test/test_servicekeyworker.py b/workers/servicekeyworker/test/test_servicekeyworker.py
new file mode 100644
index 000000000..40ddcf139
--- /dev/null
+++ b/workers/servicekeyworker/test/test_servicekeyworker.py
@@ -0,0 +1,23 @@
+from datetime import datetime, timedelta
+from mock import patch
+
+from data import model
+from workers.servicekeyworker.servicekeyworker import ServiceKeyWorker
+from util.morecollections import AttrDict
+
+from test.fixtures import *
+
+def test_refresh_service_key(initialized_db):
+  # Create a service key for testing.
+  test_key = model.service_keys.create_service_key('test', 'somekid', 'quay', '', {},
+                                                   datetime.now() + timedelta(minutes=10))
+
+  instance_keys = AttrDict(dict(local_key_id=test_key.kid, service_key_expiration=10))
+
+  with patch('workers.servicekeyworker.servicekeyworker.instance_keys', instance_keys):
+    worker = ServiceKeyWorker()
+    worker._refresh_service_key()
+
+  # Ensure the key's expiration was changed.
+  updated_key = model.service_keys.get_service_key(test_key.kid, approved_only=False)
+  assert updated_key.expiration_date > test_key.expiration_date