diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 88460865a90f65f98a0a052a74c4e8925e6296ce..6fdd02e728374135c399631012551b2e32c85d58 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -15,6 +15,8 @@ COPY . /caosdb-cppinttest
 WORKDIR /caosdb-cppinttest
 RUN rm -rf .git
 
+RUN apt-get install -y openjdk-11-jdk-headless
+
 CMD ls -la && /wait-for-it.sh caosdb-server:10443 -t 500 -- \
     # ... and run tests
     ctest