diff --git a/changelogs/fragments/server_error_deprecated_image.yml b/changelogs/fragments/server_error_deprecated_image.yml
new file mode 100644
index 0000000..6f19325
--- /dev/null
+++ b/changelogs/fragments/server_error_deprecated_image.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - hcloud_server - TypeError when trying to use deprecated image with allow_deprecated_image
diff --git a/plugins/modules/hcloud_server.py b/plugins/modules/hcloud_server.py
index 5f966e6..43c6518 100644
--- a/plugins/modules/hcloud_server.py
+++ b/plugins/modules/hcloud_server.py
@@ -516,8 +516,8 @@ class AnsibleHcloudServer(Hcloud):
             available_until = image.deprecated + timedelta(days=90)
             if self.module.params.get("allow_deprecated_image"):
                 self.module.warn(
-                    "You try to use a deprecated image. The image %s will continue to be available until %s.") % (
-                    image.name, available_until.strftime('%Y-%m-%d'))
+                    "You try to use a deprecated image. The image %s will continue to be available until %s." % (
+                        image.name, available_until.strftime('%Y-%m-%d')))
             else:
                 self.module.fail_json(
                     msg=("You try to use a deprecated image. The image %s will continue to be available until %s." +