diff --git a/drivers/iio/adc/ti-ads1298.c b/drivers/iio/adc/ti-ads1298.c
index ae30b47e4514..25261163d3e2 100644
--- a/drivers/iio/adc/ti-ads1298.c
+++ b/drivers/iio/adc/ti-ads1298.c
@@ -210,9 +210,11 @@ static int ads1298_read_one(struct ads1298_private *priv, int chan_index)
 		return ret;
 	}
 
-	/* Cannot take longer than 40ms (250Hz) */
-	ret = wait_for_completion_timeout(&priv->completion, msecs_to_jiffies(50));
-	if (!ret)
+	/*
+	 * One conversion takes at most 4ms at the lowest sample rate (250Hz).
+	 * Use 50ms to allow for kernel scheduling latency.
+	 */
+	if (!wait_for_completion_timeout(&priv->completion, msecs_to_jiffies(50)))
 		return -ETIMEDOUT;
 
 	return 0;