diff --git a/basis/io/unix/files/freebsd/freebsd.factor b/basis/io/unix/files/freebsd/freebsd.factor
index 3786a82b55..eaf217af62 100644
--- a/basis/io/unix/files/freebsd/freebsd.factor
+++ b/basis/io/unix/files/freebsd/freebsd.factor
@@ -3,7 +3,8 @@
 USING: accessors alien.c-types alien.syntax combinators
 io.backend io.files io.unix.files kernel math system unix
 unix.statfs.freebsd unix.statvfs.freebsd unix.getfsstat.freebsd
-sequences grouping alien.strings io.encodings.utf8 ;
+sequences grouping alien.strings io.encodings.utf8
+specialized-arrays.direct.uint arrays ;
 IN: io.unix.files.freebsd
 
 TUPLE: freebsd-file-system-info < unix-file-system-info
@@ -32,7 +33,7 @@ M: freebsd statfs>file-system-info ( file-system-info statvfs -- file-system-inf
         [ statfs-f_asyncreads >>asyncreads ]
         [ statfs-f_namemax >>name-max ]
         [ statfs-f_owner >>owner ]
-        [ statfs-f_fsid >>id ]
+        [ statfs-f_fsid 2 <direct-uint-array> >array >>id ]
         [ statfs-f_fstypename utf8 alien>string >>type ]
         [ statfs-f_mntfromname utf8 alien>string >>device-name ]
         [ statfs-f_mntonname utf8 alien>string >>mount-point ]
diff --git a/basis/io/unix/files/linux/linux.factor b/basis/io/unix/files/linux/linux.factor
index 3e4e1c043a..c30855c3ee 100644
--- a/basis/io/unix/files/linux/linux.factor
+++ b/basis/io/unix/files/linux/linux.factor
@@ -3,7 +3,8 @@
 USING: accessors alien.c-types alien.syntax combinators csv
 io.backend io.encodings.utf8 io.files io.streams.string
 io.unix.files kernel math.order namespaces sequences sorting
-system unix unix.statfs.linux unix.statvfs.linux ;
+system unix unix.statfs.linux unix.statvfs.linux
+specialized-arrays.direct.uint arrays ;
 IN: io.unix.files.linux
 
 TUPLE: linux-file-system-info < unix-file-system-info
@@ -23,7 +24,7 @@ M: linux statfs>file-system-info ( struct -- statfs )
         [ statfs64-f_bavail >>blocks-available ]
         [ statfs64-f_files >>files ]
         [ statfs64-f_ffree >>files-free ]
-        [ statfs64-f_fsid >>id ]
+        [ statfs64-f_fsid 2 <direct-uint-array> >array >>id ]
         [ statfs64-f_namelen >>namelen ]
         [ statfs64-f_frsize >>preferred-block-size ]
         ! [ statfs64-f_spare >>spare ]
diff --git a/basis/io/unix/files/netbsd/netbsd.factor b/basis/io/unix/files/netbsd/netbsd.factor
index 23717b41a4..82ac3dc70d 100644
--- a/basis/io/unix/files/netbsd/netbsd.factor
+++ b/basis/io/unix/files/netbsd/netbsd.factor
@@ -3,8 +3,8 @@
 USING: alien.syntax kernel unix.stat math unix
 combinators system io.backend accessors alien.c-types
 io.encodings.utf8 alien.strings unix.types io.unix.files
-io.files unix.statvfs.netbsd unix.getfsstat.netbsd
-grouping sequences io.encodings.utf8 ;
+io.files unix.statvfs.netbsd unix.getfsstat.netbsd arrays
+grouping sequences io.encodings.utf8 specialized-arrays.direct.uint ;
 IN: io.unix.files.netbsd
 
 TUPLE: netbsd-file-system-info < unix-file-system-info
@@ -35,7 +35,7 @@ M: netbsd statvfs>file-system-info ( file-system-info statvfs -- file-system-inf
         [ statvfs-f_syncwrites >>sync-writes ]
         [ statvfs-f_asyncreads >>async-reads ]
         [ statvfs-f_asyncwrites >>async-writes ]
-        [ statvfs-f_fsidx >>idx ]
+        [ statvfs-f_fsidx 2 <direct-uint-array> >array >>idx ]
         [ statvfs-f_fsid >>id ]
         [ statvfs-f_namemax >>name-max ]
         [ statvfs-f_owner >>owner ]
diff --git a/basis/io/unix/files/openbsd/openbsd.factor b/basis/io/unix/files/openbsd/openbsd.factor
index 8c8f7c154b..e5e18b29ea 100644
--- a/basis/io/unix/files/openbsd/openbsd.factor
+++ b/basis/io/unix/files/openbsd/openbsd.factor
@@ -3,7 +3,8 @@
 USING: accessors alien.c-types alien.strings alien.syntax
 combinators io.backend io.files io.unix.files kernel math
 sequences system unix unix.getfsstat.openbsd grouping
-unix.statfs.openbsd unix.statvfs.openbsd unix.types ;
+unix.statfs.openbsd unix.statvfs.openbsd unix.types
+specialized-arrays.direct.uint arrays ;
 IN: io.unix.files.openbsd
 
 TUPLE: freebsd-file-system-info < unix-file-system-info
@@ -30,7 +31,7 @@ M: openbsd statfs>file-system-info ( file-system-info statfs -- file-system-info
         [ statfs-f_syncreads >>sync-reads ]
         [ statfs-f_asyncwrites >>async-writes ]
         [ statfs-f_asyncreads >>async-reads ]
-        [ statfs-f_fsid >>id ]
+        [ statfs-f_fsid 2 <direct-uint-array> >array >>id ]
         [ statfs-f_namemax >>name-max ]
         [ statfs-f_owner >>owner ]
         ! [ statfs-f_spare >>spare ]