diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 03a14a3..627e2c0 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -105,6 +105,8 @@
 extern int mmc_wait_for_app_cmd(struct mmc_host *, unsigned int,
 	struct mmc_command *, int);
 
+extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *, int);
+
 extern int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card);
 
 static inline void mmc_claim_host(struct mmc_host *host)