diff --git a/src/script/api/script_asyncmode.hpp b/src/script/api/script_asyncmode.hpp
--- a/src/script/api/script_asyncmode.hpp
+++ b/src/script/api/script_asyncmode.hpp
@@ -57,7 +57,7 @@ public:
 	/**
 	 * @api -all
 	 */
-	virtual void FinalRelease();
+	void FinalRelease() override;
 };
 
 #endif /* SCRIPT_ASYNCMODE_HPP */