diff --git a/basis/unix/statfs/macosx/macosx.factor b/basis/unix/statfs/macosx/macosx.factor
index 82f999ea5a..8e61d22d24 100644
--- a/basis/unix/statfs/macosx/macosx.factor
+++ b/basis/unix/statfs/macosx/macosx.factor
@@ -2,7 +2,8 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: alien.c-types io.encodings.utf8 io.encodings.string
 kernel sequences unix.stat accessors unix combinators math
-grouping system unix.statfs io.files io.backend alien.strings ;
+grouping system unix.statfs io.files io.backend alien.strings
+math.bitwise alien.syntax ;
 IN: unix.statfs.macosx
 
 : MNT_RDONLY  HEX: 00000001 ; inline