diff --git a/.travis-docker.sh b/.travis-docker.sh
index 3bbba69..1c4af17 100644
--- a/.travis-docker.sh
+++ b/.travis-docker.sh
@@ -44,9 +44,9 @@ fi
 
 echo RUN opam update -u -y >> Dockerfile
 echo RUN opam depext -ui travis-opam >> Dockerfile
-echo RUN cp "~/.opam/${OCAML_VERSION}/bin/ci-opam" "~/" >> Dockerfile
+echo RUN cp '~/.opam/$(opam switch show)/bin/ci-opam' "~/" >> Dockerfile
 echo RUN opam remove -a travis-opam >> Dockerfile
-echo RUN mv "~/ci-opam" "~/.opam/${OCAML_VERSION}/bin/ci-opam" >> Dockerfile
+echo RUN mv "~/ci-opam" '~/.opam/$(opam switch show)/bin/ci-opam' >> Dockerfile
 echo VOLUME /repo >> Dockerfile
 echo WORKDIR /repo >> Dockerfile
 docker build -t local-build .