diff --git a/ci.sh b/ci.sh
index 6306b591f1a8c4fb68279debc75b7375236cfc10..bc15af5d5002e853cdfc090a8085992440bafd4e 100755
--- a/ci.sh
+++ b/ci.sh
@@ -76,4 +76,4 @@ cleanup () {
 trap cleanup EXIT
 
 # run the build
-nix-build --no-out-link "$curdir/nix/pkgs.nix" $OPTS -A ocamlPackages.meta
+nix-build --no-out-link "$curdir/nix/pkgs.nix" $OPTS -A ocaml-ng.ocamlPackages_4_12.meta