diff --git a/libcloud/test/compute/test_openstack.py b/libcloud/test/compute/test_openstack.py
index 88ad045b58..5c354b9986 100644
--- a/libcloud/test/compute/test_openstack.py
+++ b/libcloud/test/compute/test_openstack.py
@@ -2553,7 +2553,7 @@ def test_ex_attach_floating_ip_to_node(self):
         node = self.driver.create_node(name="racktest", image=image, size=size)
         node.id = 4242
         ip = "42.42.42.42"
-        port_id = 'ce531f90-199f-48c0-816c-13e38010b442'
+        port_id = "ce531f90-199f-48c0-816c-13e38010b442"
 
         self.assertTrue(self.driver.ex_attach_floating_ip_to_node(node, ip, port_id))