diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 969c06b7d2b7..e535cec9fc02 100644
--- a/drivers/iio/adc/ad7923.c
+++ b/drivers/iio/adc/ad7923.c
@@ -184,7 +184,7 @@ static irqreturn_t ad7923_trigger_handler(int irq, void *p)
 	return IRQ_HANDLED;
 }
 
-static int ad7923_scan_direct(struct ad7923_state *st, unsigned ch)
+static int ad7923_scan_direct(struct ad7923_state *st, unsigned int ch)
 {
 	int ret, cmd;