diff --git a/drivers/net/cs89x0.c b/drivers/net/cs89x0.c
index 2b4c921..4cf82cf 100644
--- a/drivers/net/cs89x0.c
+++ b/drivers/net/cs89x0.c
@@ -805,7 +805,7 @@
 		        i = cs8900_irq_map[0];
 #else
 			/* Translate the IRQ using the IRQ mapping table. */
-			if (i >= sizeof(cs8900_irq_map)/sizeof(cs8900_irq_map[0]))
+			if (i >= ARRAY_SIZE(cs8900_irq_map))
 				printk("\ncs89x0: invalid ISA interrupt number %d\n", i);
 			else
 				i = cs8900_irq_map[i];
@@ -1246,11 +1246,11 @@
 
 	if (chip_type == CS8900) {
 		/* Search the mapping table for the corresponding IRQ pin. */
-		for (i = 0; i != sizeof(cs8900_irq_map)/sizeof(cs8900_irq_map[0]); i++)
+		for (i = 0; i != ARRAY_SIZE(cs8900_irq_map); i++)
 			if (cs8900_irq_map[i] == irq)
 				break;
 		/* Not found */
-		if (i == sizeof(cs8900_irq_map)/sizeof(cs8900_irq_map[0]))
+		if (i == ARRAY_SIZE(cs8900_irq_map))
 			i = 3;
 		writereg(dev, PP_CS8900_ISAINT, i);
 	} else {