diff --git a/drivers/ufs/ufs.c b/drivers/ufs/ufs.c
index 5ba5eb0..19f894f 100644
--- a/drivers/ufs/ufs.c
+++ b/drivers/ufs/ufs.c
@@ -609,7 +609,7 @@
 	       UTRIACR_IATOVAL(0xFF);
 	mmio_write_32(ufs_params.reg_base + UTRIACR, data);
 	/* send request */
-	mmio_setbits_32(ufs_params.reg_base + UTRLDBR, 1 << slot);
+	mmio_setbits_32(ufs_params.reg_base + UTRLDBR, 1U << slot);
 }
 
 static int ufs_check_resp(utp_utrd_t *utrd, int trans_type, unsigned int timeout_ms)