diff --git a/Docker/lofar-ci/Dockerfile_ci_sas b/Docker/lofar-ci/Dockerfile_ci_sas
index 6e929ec90e044873b36ef8a5a4c2e410b707368d..bbc740bbe9e0a1028594d8ff0b0ac2d7f083b0fb 100644
--- a/Docker/lofar-ci/Dockerfile_ci_sas
+++ b/Docker/lofar-ci/Dockerfile_ci_sas
@@ -6,7 +6,7 @@
 FROM ci_base:latest
 
 RUN echo "Installing packages for SAS..." && \
-    yum install -y log4cplus log4cplus-devel python3 python3-libs python3-devel boost readline-devel boost-devel binutils-devel boost-python36 boost-python36-devel gettext which openldap-devel npm nodejs git java-11-openjdk
+    yum install -y log4cplus log4cplus-devel python3 python3-libs python3-devel boost readline-devel boost-devel binutils-devel boost-python36 boost-python36-devel gettext which openldap-devel npm nodejs git java-11-openjdk twistd
     
 # see https://www.postgresql.org/download/linux/redhat/ on how to install postgresql-server > 9.2 on centos7 
 RUN yum erase -y postgresql postgresql-server postgresql-devel && \