diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index abe0218d1306..6df435e3c421 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -327,7 +327,7 @@ static int ad7192_of_clock_select(struct ad7192_state *st)
 	clock_sel = AD7192_CLK_INT;
 
 	/* use internal clock */
-	if (st->mclk) {
+	if (!st->mclk) {
 		if (of_property_read_bool(np, "adi,int-clock-output-enable"))
 			clock_sel = AD7192_CLK_INT_CO;
 	} else {