diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index d6f20cc..17d7148 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -361,6 +361,8 @@
 
 	unsigned int		actual_clock;	/* Actual HC clock rate */
 
+	unsigned int		slotno;	/* used for sdio acpi binding */
+
 	unsigned long		private[0] ____cacheline_aligned;
 };