diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6f97eb4..006f88e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,8 +35,10 @@ jobs:
           dune-cache: true
           allow-prerelease-opam: true
 
+      - run: opam install . --with-test --deps-only
+
       - name: configure tree
-        run: opam exec -- ./configure
+        run: opam exec -- sh ./configure
 
       - name: Build
         run: opam exec -- make