diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index c0b7852f1c84..659821a1e2cb 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -117,8 +117,8 @@ struct ad9832_state {
 
 static unsigned long ad9832_calc_freqreg(unsigned long mclk, unsigned long fout)
 {
-	unsigned long long freqreg = (u64)fout *
-				     (u64)((u64)1L << AD9832_FREQ_BITS);
+	u64 freqreg = (u64)fout << AD9832_FREQ_BITS;
+
 	do_div(freqreg, mclk);
 	return freqreg;
 }