diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 7ad463e9741c0e4359b0c2c10a43f83ea3683995..c67120bf2e93f18a25e71073a00c5d04be625a5f 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -719,7 +719,7 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
 	data->bytes_xfered = 0;
 
 	clks = (unsigned long long)data->timeout_ns * host->cclk;
-	do_div(clks, 1000000000UL);
+	do_div(clks, NSEC_PER_SEC);
 
 	timeout = data->timeout_clks + (unsigned int)clks;