diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index c69241a025b2dc7494ea168c82a42bbf252bdf67..37a911ab27bad0a974a53eb4476ff73e56ceb17a 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -24,6 +24,6 @@ CMD ls -la && \
     mkdir build && \
     cd build && \
     /wait-for-it.sh caosdb-server:10443 -t 500 -- \
-    cmake -D CMAKE_PREFIX_PATH=/usr/local/lib/libcaosdb-${CPPLIB_VERSION} .. && \
+    cmake -D CMAKE_PREFIX_PATH=/usr/local/lib/libcaosdb-$CPPLIB_VERSION .. && \
     cmake --build . && \
     ctest