diff --git a/source/script.php b/source/script.php
index 764c5b16..0a29545a 100644
--- a/source/script.php
+++ b/source/script.php
@@ -595,12 +595,14 @@ class Pkg_MokowaasInstallerScript
 			$db = Factory::getDbo();
 			$dynamicUrl = 'https://git.mokoconsulting.tech/MokoConsulting/MokoWaaS/updates.xml';
 
-			// Find all MokoWaaS update sites
+			// Find MokoWaaS update sites (exclude MokoWaaSBase and other Moko extensions)
 			$query = $db->getQuery(true)
 				->select($db->quoteName(['update_site_id', 'location']))
 				->from($db->quoteName('#__update_sites'))
 				->where('(' . $db->quoteName('name') . ' LIKE ' . $db->quote('%MokoWaaS%')
-					. ' OR ' . $db->quoteName('location') . ' LIKE ' . $db->quote('%MokoWaaS%') . ')');
+					. ' OR ' . $db->quoteName('location') . ' LIKE ' . $db->quote('%MokoWaaS%') . ')')
+				->where($db->quoteName('name') . ' NOT LIKE ' . $db->quote('%MokoWaaSBase%'))
+				->where($db->quoteName('location') . ' NOT LIKE ' . $db->quote('%MokoWaaSBase%'));
 			$db->setQuery($query);
 			$sites = $db->loadObjectList();