diff --git a/scripts/Dockerfile.build_deps.in b/scripts/Dockerfile.build_deps.in
index 030511316..28c8411a2 100644
--- a/scripts/Dockerfile.build_deps.in
+++ b/scripts/Dockerfile.build_deps.in
@@ -3,6 +3,7 @@ FROM ocaml/opam:alpine-$alpine_version_ocaml-$ocaml_version
 COPY scripts/install_build_deps.sh scripts/version.sh scripts/
 COPY src/tezos-deps.opam src/
 RUN sudo apk add libsodium-dev && \
+    opam switch $ocaml_version && \
     opam config exec -- ./scripts/install_build_deps.sh all \
     rm -fr ~/.opam/log/ \
            "$(opam config exec -- ocamlfind query stdlib)"/topdirs.cmi