diff --git a/src/MadeYourDay/Contao/SliderRunonce.php b/src/MadeYourDay/Contao/SliderRunonce.php
index 3190681..9cf6d24 100644
--- a/src/MadeYourDay/Contao/SliderRunonce.php
+++ b/src/MadeYourDay/Contao/SliderRunonce.php
@@ -33,7 +33,10 @@ public static function run()
 		) {
 			$result = $database->prepare('SELECT lickey FROM tl_repository_installs WHERE extension = \'rocksolid-slider-pro\'')->execute();
 			if ($result && Slider::checkLicense((string)$result->lickey)) {
-				\Config::persist('rocksolid_slider_license', (string)$result->lickey);
+				\Config::getInstance()->add(
+					'$GLOBALS[\'TL_CONFIG\'][\'rocksolid_slider_license\']',
+					(string)$result->lickey
+				);
 			}
 		}