diff --git a/Dockerfile b/Dockerfile
index 6026604..cf6756f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -40,7 +40,7 @@ ENV DEBIAN_FRONTEND=noninteractive TZ=Europe/Berlin
 RUN apt-get update && \
     apt-get -y install --no-install-recommends build-essential git cmake autoconf automake unzip libtool-bin pkgconf libssl-dev \
         python2.7 python-pip libcppunit-dev swig uuid-dev libusb-1.0-0-dev \
-        python-mako libzmq3-dev libcomedi-dev python-sip-dev socat && \
+        python-mako libzmq3-dev libcomedi-dev python-sip-dev python-six socat && \
     rm -rf /var/lib/apt/lists/*