diff --git a/core/docker-entrypoint.sh b/core/docker-entrypoint.sh
index 6bc9d38..6fd2cc0 100755
--- a/core/docker-entrypoint.sh
+++ b/core/docker-entrypoint.sh
@@ -225,7 +225,7 @@ echo "HYPERKITTY_API_KEY not defined, skipping HyperKitty setup..."
 fi
 
 # Generate the LMTP files for postfix if needed.
-mailman aliases
+su-exec mailman mailman aliases
 
 # Now chown the places where mailman wants to write stuff.
 chown -R mailman /opt/mailman