diff --git a/BaseFilter/sections/adservers_firstparty.txt b/BaseFilter/sections/adservers_firstparty.txt
index bb219616281..c7a73105e5a 100644
--- a/BaseFilter/sections/adservers_firstparty.txt
+++ b/BaseFilter/sections/adservers_firstparty.txt
@@ -182,6 +182,7 @@
 ||newrevive.detik.com^
 ||ad.serv1for.pro^
 ||res.adx.opera.com^
+||res.oa.opera.com^
 ||ads.rubiconproject.com^
 ||eus.rubiconproject.com^
 ||fastlane.rubiconproject.com^