diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cb746cecd7265a9c2dba0d5141644cc42468a4d6..ff84b58178d9f2e5dc3658ebfbc26fc4fe017758 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -237,6 +237,7 @@ test-clang-8:
     - ctest -j4 -VV | gzip -v -9 > test.log.gz 
   rules:
     - if: '$CI_MERGE_REQUEST_ID && $CI_MERGE_REQUEST_TITLE =~ /^WIP:/'
+      allow_failure: false
     - if: $CI_MERGE_REQUEST_ID
       when: manual
       allow_failure: true