diff --git a/libfdt/fdt_sw.c b/libfdt/fdt_sw.c
index 178b365..024f4d8 100644
--- a/libfdt/fdt_sw.c
+++ b/libfdt/fdt_sw.c
@@ -170,7 +170,7 @@ int fdt_resize(void *fdt, void *buf, int bufsize)
 
 	FDT_SW_PROBE(fdt);
 
-	headsize = fdt_off_dt_struct(fdt);
+	headsize = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
 	tailsize = fdt_size_dt_strings(fdt);
 
 	if ((headsize + tailsize) > bufsize)