diff --git a/src/kernel/boot/platform/openfirmware/openfirmware.h b/src/kernel/boot/platform/openfirmware/openfirmware.h
index df4330b646..f5c03a6a30 100644
--- a/src/kernel/boot/platform/openfirmware/openfirmware.h
+++ b/src/kernel/boot/platform/openfirmware/openfirmware.h
@@ -15,6 +15,18 @@
 extern int gChosen;
 
 
+struct of_arguments {
+	const char	*name;
+	int			num_args;
+	int			num_returns;
+	int			data[0];
+
+#ifdef __cplusplus
+	int &Argument(int index) { return data[index]; }
+	int &ReturnValue(int index) { return data[num_args + index]; }
+#endif
+};
+
 struct of_region {
 	void	*base;
 	uint32	size;