diff --git a/taskcluster/ci/fetch/toolchains.yml b/taskcluster/ci/fetch/toolchains.yml
index d02c8ef192191..d6ada9db37e7a 100644
--- a/taskcluster/ci/fetch/toolchains.yml
+++ b/taskcluster/ci/fetch/toolchains.yml
@@ -186,7 +186,7 @@ zlib-1.2.11:
     description: zlib 1.2.11 source code
     fetch:
         type: static-url
-        url: http://zlib.net/zlib-1.2.11.tar.gz
+        url: https://downloads.sourceforge.net/project/libpng/zlib/1.2.11/zlib-1.2.11.tar.gz
         sha256: c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
         size: 607698
         gpg-signature: