diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 6da5ebb25502193f5e8d16b42d0472a7a673eddf..79c53b8e195c5de380b83afde3357d593ed4b1b9 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -279,7 +279,7 @@ static int at91_adc_trigger_init(struct iio_dev *idev)
 	int i, ret;
 
 	st->trig = devm_kzalloc(&idev->dev,
-				st->trigger_number * sizeof(st->trig),
+				st->trigger_number * sizeof(*st->trig),
 				GFP_KERNEL);
 
 	if (st->trig == NULL) {