diff --git a/packages/ocaml-variants/ocaml-variants.5.2.0+ox/opam b/packages/ocaml-variants/ocaml-variants.5.2.0+ox/opam
index 5d3145dc9..fa314698a 100644
--- a/packages/ocaml-variants/ocaml-variants.5.2.0+ox/opam
+++ b/packages/ocaml-variants/ocaml-variants.5.2.0+ox/opam
@@ -68,7 +68,7 @@ build: [
     "-exc"
     "PATH=%{build}%/init_deps/bin/:$PATH ./configure --enable-middle-end=flambda2 --enable-runtime5 --enable-stack-checks --enable-poll-insertion --enable-multidomain --disable-warn-error '--prefix=%{prefix}%' '--with-dune=%{build}%/init_deps/bin/dune'"
   ]
-  ["sh" "-exc" "PATH=%{build}%/init_deps/bin/:$PATH make -j%{jobs}%"]
+  ["sh" "-exc" "unset INSIDE_DUNE; PATH=%{build}%/init_deps/bin/:$PATH make -j%{jobs}%"]
 ]
 install: ["sh" "-exc" "PATH=%{build}%/init_deps/bin/:$PATH make install"]
 extra-source "init-compiler.tar.gz" {