diff --git a/basis/unix/statfs/freebsd/freebsd.factor b/basis/unix/statfs/freebsd/freebsd.factor
index e6a033e09d..17b58aede6 100644
--- a/basis/unix/statfs/freebsd/freebsd.factor
+++ b/basis/unix/statfs/freebsd/freebsd.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2008 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: alien.syntax ;
+USING: alien.syntax constants ;
 IN: unix.statfs.freebsd
 
 CONSTANT: MFSNAMELEN      16            ! length of type name including null */
diff --git a/basis/unix/statfs/openbsd/openbsd.factor b/basis/unix/statfs/openbsd/openbsd.factor
index f495f2af4e..d9e6b867b6 100644
--- a/basis/unix/statfs/openbsd/openbsd.factor
+++ b/basis/unix/statfs/openbsd/openbsd.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2008 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: alien.syntax ;
+USING: alien.syntax constants ;
 IN: unix.statfs.openbsd
 
 CONSTANT: MFSNAMELEN 16
diff --git a/basis/unix/statvfs/linux/linux.factor b/basis/unix/statvfs/linux/linux.factor
index c92fef6aaa..5c04468ad3 100644
--- a/basis/unix/statvfs/linux/linux.factor
+++ b/basis/unix/statvfs/linux/linux.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2008 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: alien.syntax ;
+USING: alien.syntax constants ;
 IN: unix.statvfs.linux
 
 C-STRUCT: statvfs64
diff --git a/basis/unix/utmpx/utmpx.factor b/basis/unix/utmpx/utmpx.factor
index 6b70ceee2e..30dac2de1f 100644
--- a/basis/unix/utmpx/utmpx.factor
+++ b/basis/unix/utmpx/utmpx.factor
@@ -3,7 +3,7 @@
 USING: alien.c-types alien.syntax combinators continuations
 io.encodings.string io.encodings.utf8 kernel sequences strings
 unix calendar system accessors unix.time calendar.unix
-vocabs.loader ;
+vocabs.loader constants ;
 IN: unix.utmpx
 
 CONSTANT: EMPTY 0