diff --git a/src/base_media_base.h b/src/base_media_base.h
--- a/src/base_media_base.h
+++ b/src/base_media_base.h
@@ -176,7 +176,7 @@ protected:
 	static Tbase_set *duplicate_sets; ///< All sets that aren't available, but needed for not downloading base sets when a newer version than the one on BaNaNaS is loaded.
 	static const Tbase_set *used_set; ///< The currently used set
 
-	/* virtual */ bool AddFile(const char *filename, size_t basepath_length, const char *tar_filename);
+	bool AddFile(const char *filename, size_t basepath_length, const char *tar_filename) override;
 
 	/**
 	 * Get the extension that is used to identify this set.