diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2e46bb212e774a4175bcc8e5e1bd2d3597dfbcbf..0855263f0df4187a43039ca30acfbabee65c31ee 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -31,6 +31,7 @@ build-coq.dev:
   variables:
     OCAML: "ocaml-base-compiler.4.07.0"
     OPAM_PINS: "coq version dev"
+    CI_COQCHK: "1"
 
 build-coq.8.9.0:
   <<: *template