diff --git a/drivers/spi/spi_sh_sci.c b/drivers/spi/spi_sh_sci.c
index 7d36720eb98299858878c777ffe09b74d6641a96..a65c12ffa73352a79a160dcc5ae665fecb862dc1 100644
--- a/drivers/spi/spi_sh_sci.c
+++ b/drivers/spi/spi_sh_sci.c
@@ -148,7 +148,7 @@ static int sh_sci_spi_probe(struct platform_device *dev)
 		ret = -ENOENT;
 		goto err1;
 	}
-	sp->membase = ioremap(r->start, r->end - r->start + 1);
+	sp->membase = ioremap(r->start, resource_size(r));
 	if (!sp->membase) {
 		ret = -ENXIO;
 		goto err1;