diff --git a/w29ee011.c b/w29ee011.c
index d54b038..fa3aa7c 100644
--- a/w29ee011.c
+++ b/w29ee011.c
@@ -62,7 +62,7 @@
 	*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
 	myusec_delay(10);
 
-	printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
+	printf_debug("%s: id1 0x%02x, id2 0x%02x\n", __FUNCTION__, id1, id2);
 
 	if (id1 == flash->manufacture_id && id2 == flash->model_id)
 		return 1;