diff --git a/foo.h b/foo.h
index f8a94c1..6280dba 100644
--- a/foo.h
+++ b/foo.h
@@ -1,3 +1,5 @@
-/**/
+#define bit_for_each64(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))