diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c
index 9397d2f..a4edc43 100644
--- a/drivers/hwmon/i5k_amb.c
+++ b/drivers/hwmon/i5k_amb.c
@@ -274,8 +274,9 @@ static int i5k_amb_hwmon_init(struct platform_device *pdev)
 		num_ambs += hweight16(data->amb_present[i] & 0x7fff);
 
 	/* Set up sysfs stuff */
-	data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
-				GFP_KERNEL);
+	data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB,
+					  sizeof(*data->attrs)),
+			      GFP_KERNEL);
 	if (!data->attrs)
 		return -ENOMEM;
 	data->num_attrs = 0;