diff --git a/.github/workflows/mkosi.yml b/.github/workflows/mkosi.yml
index 425d737b62..62efd367cb 100644
--- a/.github/workflows/mkosi.yml
+++ b/.github/workflows/mkosi.yml
@@ -117,6 +117,8 @@ jobs:
 
     - name: Configure
       run: |
+        # XXX: drop after the HyperV bug that breaks secure boot KVM guests is solved
+        sed -i "s/'firmware'\s*:\s*'auto'/'firmware' : 'uefi'/g" test/*/meson.build
         tee mkosi.local.conf <<EOF
         [Distribution]
         Distribution=${{ matrix.distro }}