diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index be44d9b34b68ed01f746a95edd8f19488480c05b..1854a42a694896a413572c324941a92d6757963c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -89,7 +89,7 @@ test:
     - mkdir build
     - cd build
     - VERSION="$(conan inspect --raw version ..)"
-    - conan install -s "compiler.libcxx=libstdc++11" -o build_acm=True .. "caosdb/$VERSION@_/_"
+    - conan install -s "compiler.libcxx=libstdc++11" --build=missing -o build_acm=True .. "caosdb/$VERSION@_/_"
     - cmake -DCMAKE_BUILD_TYPE=Debug ..
     - cmake --build . -j
     - cmake --build . -j --target unit_test_coverage