diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3336073b..851f4a5c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -502,6 +502,7 @@ build-birdlab-openbsd-71:
   <<: *build-birdlab-base
   variables:
      AUTOCONF_VERSION: "2.71"
+     CC: clang
   tags:
     - birdlab-openbsd-71
     - amd64