diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index 3110bf7..92c53ce 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c
@@ -825,8 +825,8 @@ static int hifn_register_rng(struct hifn_device *dev)
 	/*
 	 * We must wait at least 256 Pk_clk cycles between two reads of the rng.
 	 */
-	dev->rng_wait_time	= DIV_ROUND_UP(NSEC_PER_SEC, dev->pk_clk_freq) *
-				  256;
+	dev->rng_wait_time	= DIV_ROUND_UP((unsigned int)NSEC_PER_SEC,
+					       dev->pk_clk_freq) * 256;
 
 	dev->rng.name		= dev->name;
 	dev->rng.data_present	= hifn_rng_data_present,