diff --git a/tempest/api/compute/admin/test_aggregates.py b/tempest/api/compute/admin/test_aggregates.py
index ac1bfee..fbcc1d1 100644
--- a/tempest/api/compute/admin/test_aggregates.py
+++ b/tempest/api/compute/admin/test_aggregates.py
@@ -25,8 +25,6 @@
 class AggregatesAdminTestJSON(base.BaseV2ComputeAdminTest):
     """Tests Aggregates API that require admin privileges"""
 
-    _host_key = 'OS-EXT-SRV-ATTR:host'
-
     @classmethod
     def setup_clients(cls):
         super(AggregatesAdminTestJSON, cls).setup_clients()
@@ -223,4 +221,4 @@
                                          availability_zone=az_name,
                                          wait_until='ACTIVE')
         body = admin_servers_client.show_server(server['id'])['server']
-        self.assertEqual(self.host, body[self._host_key])
+        self.assertEqual(self.host, body['OS-EXT-SRV-ATTR:host'])
diff --git a/tempest/api/compute/admin/test_live_migration.py b/tempest/api/compute/admin/test_live_migration.py
index dd7beaa..fd309eb 100644
--- a/tempest/api/compute/admin/test_live_migration.py
+++ b/tempest/api/compute/admin/test_live_migration.py
@@ -26,7 +26,6 @@
 
 
 class LiveBlockMigrationTestJSON(base.BaseV2ComputeAdminTest):
-    _host_key = 'OS-EXT-SRV-ATTR:host'
     max_microversion = '2.24'
     block_migration = None
 
@@ -63,7 +62,7 @@
         return body
 
     def _get_host_for_server(self, server_id):
-        return self._get_server_details(server_id)[self._host_key]
+        return self._get_server_details(server_id)['OS-EXT-SRV-ATTR:host']
 
     def _migrate_server_to(self, server_id, dest_host, volume_backed=False):
         kwargs = dict()
diff --git a/tempest/api/compute/admin/test_servers.py b/tempest/api/compute/admin/test_servers.py
index 0498d3b..94c9a29 100755
--- a/tempest/api/compute/admin/test_servers.py
+++ b/tempest/api/compute/admin/test_servers.py
@@ -24,8 +24,6 @@
 class ServersAdminTestJSON(base.BaseV2ComputeAdminTest):
     """Tests Servers API using admin privileges"""
 
-    _host_key = 'OS-EXT-SRV-ATTR:host'
-
     @classmethod
     def setup_clients(cls):
         super(ServersAdminTestJSON, cls).setup_clients()
@@ -114,7 +112,7 @@
         self.addCleanup(self.client.delete_server, test_server['id'])
         server = self.client.show_server(test_server['id'])['server']
         self.assertEqual(server['status'], 'ACTIVE')
-        hostname = server[self._host_key]
+        hostname = server['OS-EXT-SRV-ATTR:host']
         params = {'host': hostname}
         body = self.client.list_servers(**params)
         servers = body['servers']
diff --git a/tempest/api/compute/test_live_block_migration_negative.py b/tempest/api/compute/test_live_block_migration_negative.py
index dc57396..ffd274f 100644
--- a/tempest/api/compute/test_live_block_migration_negative.py
+++ b/tempest/api/compute/test_live_block_migration_negative.py
@@ -24,8 +24,6 @@
 
 
 class LiveBlockMigrationNegativeTestJSON(base.BaseV2ComputeAdminTest):
-    _host_key = 'OS-EXT-SRV-ATTR:host'
-
     @classmethod
     def skip_checks(cls):
         super(LiveBlockMigrationNegativeTestJSON, cls).skip_checks()