diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 84c38fd..d84b203 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -64,7 +64,7 @@
 	struct device_node *root, *node = NULL;
 	struct property *p;
 	uint32_t dt_struct;
-	struct fdt_node_header *fnh;
+	const struct fdt_node_header *fnh;
 	void *dt_strings;
 	struct fdt_header f;
 	int ret;