diff --git a/.github/workflows/compat.yml b/.github/workflows/compat.yml
index 6523bae..e52dd86 100644
--- a/.github/workflows/compat.yml
+++ b/.github/workflows/compat.yml
@@ -27,7 +27,7 @@ jobs:
         shell: bash
         run: |
           # Enable sources & install dependencies
-          sudo find /etc/apt/sources.list* -type f -exec sed -i 'p; s/^deb /deb-src /' '{}' +
+          sudo sed -i 's/^Types: deb$/Types: deb deb-src/' /etc/apt/sources.list.d/ubuntu.sources
           sudo apt-get update
           sudo apt-get build-dep findutils
       - name: Run GNU tests