diff --git a/foo.h b/foo.h
index 08d964e..2ca7dea 100644
--- a/foo.h
+++ b/foo.h
@@ -1,2 +1,5 @@
+#define bit_for_each64_2(pos, tmp, ul)  for (tmp = ul, pos = ffs64(tmp); pos; tmp &= (tmp - 1),  pos = ffs64(tmp))
+
 #define bit_for_each64(pos, tmp, ul)  \
     for (tmp = ul, pos = ffs64(tmp); pos; tmp &= (tmp - 1),  pos = ffs64(tmp))
+