diff --git a/openstackclient/network/v2/port.py b/openstackclient/network/v2/port.py
index 3a32916b78..0ed2e44a2d 100644
--- a/openstackclient/network/v2/port.py
+++ b/openstackclient/network/v2/port.py
@@ -519,7 +519,6 @@ class ListPort(command.Lister):
 
     def take_action(self, parsed_args):
         network_client = self.app.client_manager.network
-        compute_client = self.app.client_manager.compute
         identity_client = self.app.client_manager.identity
 
         columns = (
@@ -548,6 +547,7 @@ class ListPort(command.Lister):
                                                  ignore_missing=False)
             filters['device_id'] = _router.id
         if parsed_args.server:
+            compute_client = self.app.client_manager.compute
             server = utils.find_resource(compute_client.servers,
                                          parsed_args.server)
             filters['device_id'] = server.id
diff --git a/releasenotes/notes/bug-1688194-bb008b65267a1169.yaml b/releasenotes/notes/bug-1688194-bb008b65267a1169.yaml
new file mode 100644
index 0000000000..f7e6ad4975
--- /dev/null
+++ b/releasenotes/notes/bug-1688194-bb008b65267a1169.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fix issue in ``port list`` command when no Compute endpoint is in the
+    Service Catalog.
+    [Bug `1688194 <https://bugs.launchpad.net/bugs/1688194>`_]