diff --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
index 47ba464..0ebaef5 100644
--- a/include/linux/mmc/sdio.h
+++ b/include/linux/mmc/sdio.h
@@ -95,6 +95,8 @@
 #define  SDIO_BUS_WIDTH_1BIT	0x00
 #define  SDIO_BUS_WIDTH_4BIT	0x02
 
+#define  SDIO_BUS_ASYNC_INT	0x20
+
 #define  SDIO_BUS_CD_DISABLE     0x80	/* disable pull-up on DAT3 (pin 1) */
 
 #define SDIO_CCCR_CAPS		0x08