diff --git a/taskcluster/docker/run-task/system-setup.sh b/taskcluster/docker/run-task/system-setup.sh
index 310a40fa0..b9f7fa813 100644
--- a/taskcluster/docker/run-task/system-setup.sh
+++ b/taskcluster/docker/run-task/system-setup.sh
@@ -19,14 +19,6 @@ apt-get install -y --force-yes --no-install-recommends \
     mercurial \
     git
 
-# mercurial setup
-CERT_PATH=/etc/ssl/certs/ca-certificates.crt
-cat >/etc/mercurial/hgrc.d/cacerts.rc <<EOF
-[web]
-cacerts = ${CERT_PATH}
-EOF
-chmod 644 /etc/mercurial/hgrc.d/cacerts.rc
-
 apt-get clean
 apt-get autoclean
 rm -rf /var/lib/apt/lists/