diff --git a/letsencrypt-auto-source/Dockerfile.redhat6 b/letsencrypt-auto-source/Dockerfile.redhat6
index 85b664aeb..122b8c379 100644
--- a/letsencrypt-auto-source/Dockerfile.redhat6
+++ b/letsencrypt-auto-source/Dockerfile.redhat6
@@ -9,8 +9,8 @@ ARG REDHAT_DIST_FLAVOR
 RUN curl -O https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm \
  && rpm -ivh epel-release-latest-6.noarch.rpm
 
-# Install pip and sudo:
-RUN yum install -y python-pip sudo
+# Install pip, sudo and additional utils:
+RUN yum install -y python-pip sudo util-linux-ng
 # Update to a stable and tested version of pip.
 # We do not use pipstrap here because it no longer supports Python 2.6.
 RUN pip install pip==9.0.1 setuptools==29.0.1 wheel==0.29.0