diff --git a/base/singularity:2.5 b/base/singularity:2.5
index 9a944638006ac51b4eac9fc716ea8e1bf3303446..de61a223a2f7b3d17269b16acf3525a699aefb19 100644
--- a/base/singularity:2.5
+++ b/base/singularity:2.5
@@ -2,7 +2,7 @@ FROM debian:stretch
   MAINTAINER Tamas Gal <tgal@km3net.de>
 
   RUN apt-get update -qq && apt-get install -y wget bzip2 python-pip git
-  RUN apt-get install -y build-essential squashfs-tools libtool autotools-dev libarchive-dev automake autoconf uuid-dev libssl-dev
+  RUN apt-get install -y build-essential squashfs-tools libtool autotools-dev libarchive-dev automake autoconf uuid-dev libssl-dev sudo
 
   RUN pip install sregistry[all]
   RUN sed -i -e 's/^Defaults\tsecure_path.*$//' /etc/sudoers