diff --git a/plinth/modules/quassel/__init__.py b/plinth/modules/quassel/__init__.py
index 284e67642..b6bcc06dc 100644
--- a/plinth/modules/quassel/__init__.py
+++ b/plinth/modules/quassel/__init__.py
@@ -98,7 +98,9 @@ class QuasselApp(app_module.App):
     def setup(self, old_version):
         """Install and configure the app."""
         super().setup(old_version)
-        self.enable()
+        if not old_version:
+            self.enable()
+
         self.get_component('letsencrypt-quassel').setup_certificates()