diff --git a/common/image.c b/common/image.c
index f7e8606..d7fcd1d 100644
--- a/common/image.c
+++ b/common/image.c
@@ -1563,7 +1563,7 @@
 	*of_flat_tree = fdt_blob;
 	*of_size = be32_to_cpu (fdt_totalsize (fdt_blob));
 	debug ("   of_flat_tree at 0x%08lx size 0x%08lx\n",
-			*of_flat_tree, *of_size);
+			(ulong)*of_flat_tree, *of_size);
 
 	return 0;