diff --git a/include/interface/platform/File.h b/include/interface/platform/File.h
index 8a12a53784..7512c840ec 100644
--- a/include/interface/platform/File.h
+++ b/include/interface/platform/File.h
@@ -27,6 +27,8 @@ struct File {
 	virtual void rewind() = 0;
 
 	virtual auto size() -> size_t = 0;
+
+	[[nodiscard]] virtual auto is_open() const -> bool = 0;
 };
 
 }	// namespace leka::interface
diff --git a/libs/FileSystemKit/include/FileSystemKit.h b/libs/FileSystemKit/include/FileSystemKit.h
index 61bbd31c43..1389855cde 100644
--- a/libs/FileSystemKit/include/FileSystemKit.h
+++ b/libs/FileSystemKit/include/FileSystemKit.h
@@ -32,7 +32,7 @@ class FileSystemKit
 		void rewind() final;
 		auto size() -> size_t final;
 
-		[[nodiscard]] auto is_open() const -> bool;
+		[[nodiscard]] auto is_open() const -> bool final;
 
 	  private:
 		std::unique_ptr<FILE, decltype(&fclose)> _file {nullptr, fclose};