diff --git a/include/linux/types.h b/include/linux/types.h
index 21b9ce8..54ae2d5 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -8,6 +8,8 @@
 	(((bits)+BITS_PER_LONG-1)/BITS_PER_LONG)
 #define DECLARE_BITMAP(name,bits) \
 	unsigned long name[BITS_TO_LONGS(bits)]
+
+#define BITS_PER_BYTE 8
 #endif
 
 #include <linux/posix_types.h>