diff --git a/Source/domainset/cdn.conf b/Source/domainset/cdn.conf
index a17a1a27..c1267afb 100644
--- a/Source/domainset/cdn.conf
+++ b/Source/domainset/cdn.conf
@@ -4836,3 +4836,4 @@ img.highporn.net
 c.tadst.com
 assets.speedvitals.com
 cwsimages.ingramcontent.com
+.cdn-zlib.sk