diff --git a/lib_ppc/bootm.c b/lib_ppc/bootm.c
index 8974ccd..7977157 100644
--- a/lib_ppc/bootm.c
+++ b/lib_ppc/bootm.c
@@ -557,7 +557,7 @@
 	if (fdt_blob >= (char *)CFG_BOOTMAPSZ)
 		relocate = 1;
 
-	of_len = be32_to_cpu (fdt_totalsize (fdt));
+	of_len = be32_to_cpu (fdt_totalsize (fdt_blob));
 
 	/* move flattend device tree if needed */
 	if (relocate) {