diff --git a/services/screenshots.py b/services/screenshots.py
index e3c0d70..6923ab7 100644
--- a/services/screenshots.py
+++ b/services/screenshots.py
@@ -80,10 +80,11 @@ def take_screenshot_wkhtmltoimage(
         "--enable-local-file-access",
         "--encoding",
         "utf-8",
-        "--user-agent",
-        _WKHTMLTOIMAGE_UA,
     ]
 
+    if _WKHTMLTOIMAGE_UA:
+        cmd.extend(["--custom-header", "User-Agent", _WKHTMLTOIMAGE_UA, "--custom-header-propagation"])
+
     if image_format in ("jpg", "jpeg"):
         cmd.extend(["--quality", str(_WKHTMLTOIMAGE_QUALITY)])