diff --git a/plugins/Marketplace/LocalPackageList.py b/plugins/Marketplace/LocalPackageList.py
index 8adb1e841e..8de153660c 100644
--- a/plugins/Marketplace/LocalPackageList.py
+++ b/plugins/Marketplace/LocalPackageList.py
@@ -92,7 +92,7 @@ class LocalPackageList(PackageList):
 
     def checkForUpdates(self, packages: List[Dict[str, Any]]) -> None:
         installed_packages = "&".join([f"installed_packages={package['package_id']}:{package['package_version']}" for package in packages])
-        request_url = f"{PACKAGE_UPDATES_URL}?installed_packages={installed_packages[:-1]}"
+        request_url = f"{PACKAGE_UPDATES_URL}?{installed_packages}"
 
         self._ongoing_requests["check_updates"] = HttpRequestManager.getInstance().get(
             request_url,