diff --git a/plinth/modules/quassel/privileged.py b/plinth/modules/quassel/privileged.py
index bab66e9dd..c5b4e29e3 100644
--- a/plinth/modules/quassel/privileged.py
+++ b/plinth/modules/quassel/privileged.py
@@ -11,3 +11,5 @@ def set_domain(domain_name: str):
     """Write a file containing domain name."""
     domain_file = pathlib.Path('/var/lib/quassel/domain-freedombox')
     domain_file.write_text(domain_name, encoding='utf-8')
+    # Ensure that that file is readable by non-privileged process.
+    domain_file.chmod(0o644)