diff --git a/plinth/modules/avahi/__init__.py b/plinth/modules/avahi/__init__.py
index 243cfd5fd..0e5e61594 100644
--- a/plinth/modules/avahi/__init__.py
+++ b/plinth/modules/avahi/__init__.py
@@ -42,8 +42,6 @@ _description = [
           'hostile local network.'), box_name=_(cfg.box_name))
 ]
 
-manual_page = 'ServiceDiscovery'
-
 app = None
 
 
diff --git a/plinth/modules/roundcube/__init__.py b/plinth/modules/roundcube/__init__.py
index 1a897d082..355610d12 100644
--- a/plinth/modules/roundcube/__init__.py
+++ b/plinth/modules/roundcube/__init__.py
@@ -39,8 +39,6 @@ _description = [
       '>https://www.google.com/settings/security/lesssecureapps</a>).'),
 ]
 
-manual_page = 'Roundcube'
-
 app = None
 
 
diff --git a/plinth/modules/searx/__init__.py b/plinth/modules/searx/__init__.py
index 5a68055c1..50bff6529 100644
--- a/plinth/modules/searx/__init__.py
+++ b/plinth/modules/searx/__init__.py
@@ -29,8 +29,6 @@ _description = [
       'It stores no cookies by default.')
 ]
 
-manual_page = 'Searx'
-
 app = None