diff --git a/drivers/net/lan91c96.c b/drivers/net/lan91c96.c
index 2bf0068..229658a 100644
--- a/drivers/net/lan91c96.c
+++ b/drivers/net/lan91c96.c
@@ -766,7 +766,7 @@
 	SMC_SELECT_BANK(dev, 3);
 	chip_id = (SMC_inw(dev, 0xA) & LAN91C96_REV_CHIPID) >> 4;
 	SMC_SELECT_BANK(dev, 0);
-	for (r = 0; r < sizeof(supported_chips) / sizeof(struct id_type); r++)
+	for (r = 0; r < ARRAY_SIZE(supported_chips); r++)
 		if (chip_id == supported_chips[r].id)
 			return r;
 	return 0;