diff --git a/LICENSE b/LICENSE
index 6b55ca9..c7237a6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2024, Developer Society Limited
+Copyright (c) 2024-2025, Developer Society Limited
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/pyimgproxy/image.py b/pyimgproxy/image.py
index 2cfa10d..b35ca04 100644
--- a/pyimgproxy/image.py
+++ b/pyimgproxy/image.py
@@ -735,7 +735,7 @@ def url(self) -> str:
         else:
             image_path = f"/plain/{self._source_url}".encode()
 
-        if self.imgproxy.key and self.imgproxy.salt and True:
+        if self.imgproxy.key and self.imgproxy.salt:
             unsigned_path = options_path_bytes + image_path
             digest = hmac.new(
                 key=self.imgproxy.key,
@@ -747,6 +747,6 @@ def url(self) -> str:
             full_path = (b"/" + signature + unsigned_path).decode()
         else:
             # No signature checking - the signature part may contain anything
-            full_path = (options_path_bytes + image_path).decode()
+            full_path = (b"/_" + options_path_bytes + image_path).decode()
 
         return f"{self.imgproxy.url}{full_path}"
diff --git a/tests/test_image.py b/tests/test_image.py
index cc60d89..8c88efa 100644
--- a/tests/test_image.py
+++ b/tests/test_image.py
@@ -383,5 +383,5 @@ def test_url_no_key_or_salt(self):
 
         self.assertEqual(
             image.url,
-            "https://example.org/thumbnail/size:640:480/plain/demo.png",
+            "https://example.org/thumbnail/_/size:640:480/plain/demo.png",
         )