diff --git a/yt_dlp/extractor/openload.py b/yt_dlp/extractor/openload.py
index 36927009d..fe4740aae 100644
--- a/yt_dlp/extractor/openload.py
+++ b/yt_dlp/extractor/openload.py
@@ -207,7 +207,7 @@ class PhantomJSwrapper(object):
 
         replaces = self.options
         replaces['url'] = url
-        user_agent = headers.get('User-Agent') or self.get_param('http_headers')['User-Agent']
+        user_agent = headers.get('User-Agent') or self.extractor.get_param('http_headers')['User-Agent']
         replaces['ua'] = user_agent.replace('"', '\\"')
         replaces['jscode'] = jscode