diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6ab0ca692772ec0b67382b5fb56803a24d9026ac..9feacee1e195ead488dbaa8cfb40b038e4dc98c3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -41,6 +41,8 @@ geomodelcore-build:
 build_slc6:
   <<: *build_template
   image: cern/slc6-base
+  allow_failure: true
+  timeout: 30 minutes
   variables:
     CMAKE_ARGS: ${CMAKE_BASE_ARGS}