diff --git a/root/setup.sh b/root/setup.sh
index 70710e3..e50fed9 100644
--- a/root/setup.sh
+++ b/root/setup.sh
@@ -190,6 +190,15 @@ function finalize_ownership() {
   # and also to the `ADD` instruction in the `Containerfile`.
   chown -R runner:runner /home/runner
   chown -R podman:podman /home/podman
+
+  # Ensure correct permissions of system configuration files.
+  # Somehow these can be set incorrectly during Containerfile
+  # ADD instruction.
+  local path
+  for path in "/etc/systemd/system.conf.d" "/etc/systemd/system/user-.slice.d"; do
+    chown root:root ${path}/*
+    chmod 0644 ${path}/*
+  done
 }
 
 check_vars