diff --git a/w49f002u.c b/w49f002u.c
index 887a15b..65b540c 100644
--- a/w49f002u.c
+++ b/w49f002u.c
@@ -44,7 +44,8 @@
 
 	myusec_delay(10);
 
-	printf(__FUNCTION__ "id1 %d, id2 %d\n", id1, id2);
+	printf("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);	
+
 	if (id1 == flash->manufacture_id && id2 == flash->model_id)
 		return 1;