diff --git a/.github/workflows/blank.yml b/.github/workflows/blank.yml
index 1fb08ecc2..54a27174d 100644
--- a/.github/workflows/blank.yml
+++ b/.github/workflows/blank.yml
@@ -36,8 +36,10 @@ jobs:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
       - run: gcc --version
+
       - name: Prepare to install cross-compiler (Ubuntu specific)
-        run: dpkg --add-architecture i386
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: sudo dpkg --add-architecture i386
 
       - run: opam pin add Lama.dev . --no-action
       - run: opam depext Lama.dev --yes --with-test