diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 054e9dfee..534550529 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
     - name: Run ruff
       run: |
         ruff --version
-        ruff mkosi/ tests/ kernel-install/50-mkosi.install
+        ruff check mkosi/ tests/ kernel-install/50-mkosi.install
 
     - name: Check that tabs are not used in code
       run: sh -c '! git grep -P "\\t" "*.py"'
diff --git a/kernel-install/50-mkosi.install b/kernel-install/50-mkosi.install
index a1c68f292..96686bf97 100644
--- a/kernel-install/50-mkosi.install
+++ b/kernel-install/50-mkosi.install
@@ -14,7 +14,6 @@ from mkosi.archive import make_cpio
 from mkosi.config import OutputFormat, __version__
 from mkosi.log import die, log_setup
 from mkosi.run import find_binary, run, uncaught_exception_handler
-from mkosi.tree import copy_tree
 from mkosi.types import PathString
 from mkosi.util import umask
 
@@ -176,7 +175,11 @@ def main() -> None:
                 continue
 
             (Path(d) / "etc" / p).parent.mkdir(parents=True, exist_ok=True)
-            copy_tree(Path("/etc") / p, Path(d) / "etc" / p, dereference=True)
+            if (Path("/etc") / p).resolve().is_file():
+                shutil.copy2(Path("/etc") / p, Path(d) / "etc" / p)
+            else:
+                shutil.copytree(Path("/etc") / p, Path(d) / "etc" / p,
+                                ignore=shutil.ignore_patterns("S.*"), dirs_exist_ok=True)
 
         cmdline += ["--package-manager-tree", d]