diff --git a/services/updateserver/joomla.go b/services/updateserver/joomla.go
index b65a900903..11139ddbc7 100644
--- a/services/updateserver/joomla.go
+++ b/services/updateserver/joomla.go
@@ -323,11 +323,13 @@ func GenerateJoomlaXML(ctx context.Context, repo *repo_model.Repository, require
 			infoURL = cfg.SupportURL
 		}
 
-		// Joomla <client> element: only relevant for plugins/modules (site vs administrator).
-		// Packages manage their own sub-extension clients; omit for package type.
+		// Joomla <client> element: packages use client_id=0 in #__extensions,
+		// so we must output <client>0</client> for Joomla to match the update
+		// to the installed extension. Other types default to "site" (client_id=0)
+		// or "administrator" (client_id=1).
 		client := "site"
 		if extType == "package" {
-			client = ""
+			client = "0"
 		}
 
 		u := xmlUpdate{