diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c11dbf899ec0e9856778aedc819a850182043422..f7adf30b02627e706bb6ada82457d30a22b667bf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,6 +12,7 @@ build:
   stage: build
   script:
     - sudo apt-get install -y m4
+    - opam repo add official "https://opam.ocaml.org/"
     - opam repo add verimag-sync-repo "http://www-verimag.imag.fr/DIST-TOOLS/SYNCHRONE/test/opam-repository"
     - opam update
     - opam install -y ocamlfind dune extlib