diff --git a/openstackclient/compute/v2/server.py b/openstackclient/compute/v2/server.py
index fff67ff7c3..bf345e658e 100644
--- a/openstackclient/compute/v2/server.py
+++ b/openstackclient/compute/v2/server.py
@@ -290,9 +290,11 @@ class AddFixedIP(command.ShowOne):
             return ((), ())
 
         kwargs = {
-            'net_id': net_id,
-            'fixed_ip': parsed_args.fixed_ip_address,
+            'net_id': net_id
         }
+        if parsed_args.fixed_ip_address:
+            kwargs['fixed_ips'] = [
+                {"ip_address": parsed_args.fixed_ip_address}]
         if parsed_args.tag:
             kwargs['tag'] = parsed_args.tag
 
@@ -451,8 +453,7 @@ class AddPort(command.Command):
             port_id = parsed_args.port
 
         kwargs = {
-            'port_id': port_id,
-            'fixed_ip': None,
+            'port_id': port_id
         }
 
         if parsed_args.tag:
@@ -506,8 +507,7 @@ class AddNetwork(command.Command):
             net_id = parsed_args.network
 
         kwargs = {
-            'net_id': net_id,
-            'fixed_ip': None,
+            'net_id': net_id
         }
 
         if parsed_args.tag:
diff --git a/openstackclient/tests/functional/compute/v2/test_server.py b/openstackclient/tests/functional/compute/v2/test_server.py
index 830b3543b6..6a6afa7c48 100644
--- a/openstackclient/tests/functional/compute/v2/test_server.py
+++ b/openstackclient/tests/functional/compute/v2/test_server.py
@@ -1250,6 +1250,62 @@ class ServerTests(common.ComputeTestCase):
         addresses = cmd_output['addresses']['private']
         self.assertNotIn(ip_address, addresses)
 
+    def test_server_add_fixed_ip(self):
+        name = uuid.uuid4().hex
+        cmd_output = self.openstack(
+            'server create ' +
+            '--network private ' +
+            '--flavor ' + self.flavor_name + ' ' +
+            '--image ' + self.image_name + ' ' +
+            '--wait ' +
+            name,
+            parse_output=True,
+        )
+
+        self.assertIsNotNone(cmd_output['id'])
+        self.assertEqual(name, cmd_output['name'])
+        self.addCleanup(self.openstack, 'server delete --wait ' + name)
+
+        # create port, record its ip address to use in later call,
+        # then delete - this is to figure out what should be a free ip
+        # in the subnet
+        port_name = uuid.uuid4().hex
+
+        cmd_output = self.openstack(
+            'port list',
+            parse_output=True,
+        )
+        self.assertNotIn(port_name, cmd_output)
+
+        cmd_output = self.openstack(
+            'port create ' +
+            '--network private ' + port_name,
+            parse_output=True,
+        )
+        self.assertIsNotNone(cmd_output['id'])
+        ip_address = cmd_output['fixed_ips'][0]['ip_address']
+        self.openstack('port delete ' + port_name)
+
+        # add fixed ip to server, assert the ip address appears
+        self.openstack('server add fixed ip --fixed-ip-address ' + ip_address +
+                       ' ' + name + ' private')
+
+        wait_time = 0
+        while wait_time < 60:
+            cmd_output = self.openstack(
+                'server show ' + name,
+                parse_output=True,
+            )
+            if ip_address not in cmd_output['addresses']['private']:
+                # Hang out for a bit and try again
+                print('retrying add fixed ip check')
+                wait_time += 10
+                time.sleep(10)
+            else:
+                break
+        addresses = cmd_output['addresses']['private']
+        self.assertIn(ip_address, addresses)
+
     def test_server_add_remove_volume(self):
         volume_wait_for = volume_common.BaseVolumeTests.wait_for_status
 
diff --git a/openstackclient/tests/unit/compute/v2/test_server.py b/openstackclient/tests/unit/compute/v2/test_server.py
index 16ec9e1274..846ad8cdca 100644
--- a/openstackclient/tests/unit/compute/v2/test_server.py
+++ b/openstackclient/tests/unit/compute/v2/test_server.py
@@ -423,8 +423,7 @@ class TestServerAddFixedIP(TestServer):
             self.assertEqual(expected_data, tuple(data))
             self.sdk_client.create_server_interface.assert_called_once_with(
                 servers[0].id,
-                net_id=network['id'],
-                fixed_ip=None
+                net_id=network['id']
             )
 
     @mock.patch.object(sdk_utils, 'supports_microversion')
@@ -479,7 +478,7 @@ class TestServerAddFixedIP(TestServer):
             self.sdk_client.create_server_interface.assert_called_once_with(
                 servers[0].id,
                 net_id=network['id'],
-                fixed_ip='5.6.7.8'
+                fixed_ips=[{'ip_address': '5.6.7.8'}]
             )
 
     @mock.patch.object(sdk_utils, 'supports_microversion')
@@ -536,7 +535,7 @@ class TestServerAddFixedIP(TestServer):
             self.sdk_client.create_server_interface.assert_called_once_with(
                 servers[0].id,
                 net_id=network['id'],
-                fixed_ip='5.6.7.8',
+                fixed_ips=[{'ip_address': '5.6.7.8'}],
                 tag='tag1',
             )
 
@@ -847,7 +846,7 @@ class TestServerAddPort(TestServer):
         result = self.cmd.take_action(parsed_args)
 
         self.sdk_client.create_server_interface.assert_called_once_with(
-            servers[0], port_id=port_id, fixed_ip=None)
+            servers[0], port_id=port_id)
         self.assertIsNone(result)
 
     def test_server_add_port(self):
@@ -885,7 +884,6 @@ class TestServerAddPort(TestServer):
         self.sdk_client.create_server_interface.assert_called_once_with(
             servers[0],
             port_id='fake-port',
-            fixed_ip=None,
             tag='tag1')
 
     @mock.patch.object(sdk_utils, 'supports_microversion', return_value=False)
@@ -1288,7 +1286,7 @@ class TestServerAddNetwork(TestServer):
         result = self.cmd.take_action(parsed_args)
 
         self.sdk_client.create_server_interface.assert_called_once_with(
-            servers[0], net_id=net_id, fixed_ip=None)
+            servers[0], net_id=net_id)
         self.assertIsNone(result)
 
     def test_server_add_network(self):
@@ -1327,7 +1325,6 @@ class TestServerAddNetwork(TestServer):
         self.sdk_client.create_server_interface.assert_called_once_with(
             servers[0],
             net_id='fake-network',
-            fixed_ip=None,
             tag='tag1'
         )