diff --git a/drivers/mmc/omap3_mmc.c b/drivers/mmc/omap3_mmc.c
index 4eda2160e3a185e554c1c16d09e7be3518e90f35..9506cca21816bd063faf04c70a51d490b33159a3 100644
--- a/drivers/mmc/omap3_mmc.c
+++ b/drivers/mmc/omap3_mmc.c
@@ -55,9 +55,9 @@ mmc_card_data cur_card_data;
 static block_dev_desc_t mmc_blk_dev;
 static hsmmc_t *mmc_base = (hsmmc_t *)OMAP_HSMMC1_BASE;
 
-unsigned char mmc_set_dev(int dev)
+int mmc_set_dev(int dev_num)
 {
-	switch (dev) {
+	switch (dev_num) {
 	case 1:
 		mmc_base = (hsmmc_t *)OMAP_HSMMC1_BASE;
 		break;
diff --git a/include/mmc.h b/include/mmc.h
index 8973bc76583ad5affaacfb4259c7b7f194a7f76e..fcb237e81e4788c03408ceeb7d1fc94fcfc9b006 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -271,6 +271,7 @@ int mmc_initialize(bd_t *bis);
 int mmc_init(struct mmc *mmc);
 int mmc_read(struct mmc *mmc, u64 src, uchar *dst, int size);
 struct mmc *find_mmc_device(int dev_num);
+int mmc_set_dev(int dev_num);
 void print_mmc_devices(char separator);
 int board_mmc_getcd(u8 *cd, struct mmc *mmc);