diff --git a/.github/actions/build-kind2/action.yml b/.github/actions/build-kind2/action.yml
index d9e7724c4..56ea4d5e8 100644
--- a/.github/actions/build-kind2/action.yml
+++ b/.github/actions/build-kind2/action.yml
@@ -14,6 +14,7 @@ runs:
     id: ocaml-variant
     shell: bash
     run: |
+      echo "::group::Set OCaml compiler variant"
       if [[ "${{ inputs.flambda }}" == "true" ]]; then
         echo "compiler=ocaml-variants.${{ inputs.ocaml-version }}+options,ocaml-option-flambda" >> $GITHUB_OUTPUT
         echo "tag=${{ inputs.ocaml-version }}-flambda" >> $GITHUB_OUTPUT
@@ -21,6 +22,7 @@ runs:
         echo "compiler=${{ inputs.ocaml-version }}" >> $GITHUB_OUTPUT
         echo "tag=${{ inputs.ocaml-version }}" >> $GITHUB_OUTPUT
       fi
+      echo "::endgroup::"
 
   - name: Set up OCaml ${{ steps.ocaml-variant.outputs.tag }}
     uses: ocaml/setup-ocaml@v2