diff --git a/.github/workflows/build-umu-debian-12.yml b/.github/workflows/build-umu-debian-12.yml
index b0bcb85f..db8f851f 100644
--- a/.github/workflows/build-umu-debian-12.yml
+++ b/.github/workflows/build-umu-debian-12.yml
@@ -27,8 +27,7 @@ jobs:
 
     - name: Initialize submodules
       run: |
-        echo "GIT_DISCOVERY_ACROSS_FILESYSTEM=1" >> $GITHUB_ENV
-        git submodule update --init --recursive
+        GIT_DISCOVERY_ACROSS_FILESYSTEM=1 git submodule update --init --recursive
 
     - name: Copy debian packaging folder to the repository root
       run: cp -rvf ./packaging/deb/debian ./debian