diff --git a/hcloud/servers/client.py b/hcloud/servers/client.py
index bf483239..0370db10 100644
--- a/hcloud/servers/client.py
+++ b/hcloud/servers/client.py
@@ -208,14 +208,12 @@ def create(self,
 
         if location is not None:
             data['location'] = location.id_or_name
-
         if datacenter is not None:
             data['datacenter'] = datacenter.id_or_name
-
         if ssh_keys is not None:
-            data['ssh_keys'] = [str(ssh_key.id_or_name) for ssh_key in ssh_keys]
+            data['ssh_keys'] = [ssh_key.id_or_name for ssh_key in ssh_keys]
         if volumes is not None:
-            data['volumes'] = [str(volume.id) for volume in volumes]
+            data['volumes'] = [volume.id for volume in volumes]
         if user_data is not None:
             data['user_data'] = user_data
         if labels is not None:
diff --git a/tests/unit/servers/test_client.py b/tests/unit/servers/test_client.py
index dd31c071..c9d45179 100644
--- a/tests/unit/servers/test_client.py
+++ b/tests/unit/servers/test_client.py
@@ -439,7 +439,7 @@ def test_create_with_volumes(self, servers_client, response_create_simple_server
                 'name': "my-server",
                 'server_type': "cx11",
                 'image': 4711,
-                'volumes': ['1', '2'],
+                'volumes': [1, 2],
                 "start_after_create": False
             }
         )