diff --git a/include/mmc.h b/include/mmc.h
index 2ad0f19..a251531 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -61,7 +61,7 @@
 #define SD_DATA_4BIT	0x00040000
 
 #define IS_SD(x)	((x)->version & SD_VERSION_SD)
-#define IS_MMC(x)	((x)->version & SD_VERSION_MMC)
+#define IS_MMC(x)	((x)->version & MMC_VERSION_MMC)
 
 #define MMC_DATA_READ		1
 #define MMC_DATA_WRITE		2