diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 5055eee43..b136dadf1 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -409,10 +409,9 @@ void *of_flatten_dtb(struct device_node *node)
 	fdt.dt_nextofs = dt_next_ofs(fdt.dt_nextofs, sizeof(struct fdt_node_header));
 
 	header.size_dt_strings = cpu_to_fdt32(fdt.str_nextofs);
-	header.size_dt_struct = cpu_to_fdt32(fdt.dt_nextofs);
+	header.size_dt_struct = cpu_to_fdt32(fdt.dt_nextofs - ofs);
 
 	header.off_dt_struct = cpu_to_fdt32(ofs);
-
 	header.off_dt_strings = cpu_to_fdt32(fdt.dt_nextofs);
 
 	if (fdt.dt_size - fdt.dt_nextofs < fdt.str_nextofs) {