diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 74e14e5..7758792 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -20,7 +20,7 @@
 #define BIT(nr)			(1UL << (nr))
 #define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
 #define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
-#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_LONG)
 
 /**
  * bitops_ffs - find first bit in word.