diff --git a/BaseFilter/sections/adservers_firstparty.txt b/BaseFilter/sections/adservers_firstparty.txt
index ae77c283a48..54e0c729f9a 100644
--- a/BaseFilter/sections/adservers_firstparty.txt
+++ b/BaseFilter/sections/adservers_firstparty.txt
@@ -7,6 +7,7 @@
 ! Bad: ||legitwebsite.com^$third-party (should be in adservers.txt)
 !
 !
+||ad.petel.bg^
 ||d2o03z2xnyxlz5.cloudfront.net^
 ||rek5.savefrom.net^
 ||creative.live.missav.com^