diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 37a911ab27bad0a974a53eb4476ff73e56ceb17a..7afebe94d05d65b298c8c9c00b7f933c2c745535 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -21,6 +21,7 @@ RUN apt-get install -y openjdk-11-jdk-headless
 # build and run tests
 CMD ls -la && \
     ls -la /usr/local/lib/ && \
+    ls -la /usr/local/lib/libcaosdb-$CPPLIB_VERSION && \
     mkdir build && \
     cd build && \
     /wait-for-it.sh caosdb-server:10443 -t 500 -- \