diff --git a/basis/unix/statfs/statfs.factor b/basis/unix/statfs/statfs.factor
index db31dabfa2..ee6ef83430 100644
--- a/basis/unix/statfs/statfs.factor
+++ b/basis/unix/statfs/statfs.factor
@@ -8,8 +8,6 @@ TUPLE: file-system-info root-directory total-free-size total-size ;
 
 HOOK: >file-system-info os ( struct -- statfs )
 
-HOOK: file-systems os ( -- array )
-
 os {
     { linux   [ "unix.statfs.linux"   require ] }
     { macosx  [ "unix.statfs.macosx"  require ] }
diff --git a/core/io/files/files.factor b/core/io/files/files.factor
index 9899f5a014..ca8125d936 100644
--- a/core/io/files/files.factor
+++ b/core/io/files/files.factor
@@ -184,6 +184,8 @@ SYMBOL: +unknown+
 
 ! File-system
 
+HOOK: file-systems os ( -- array )
+
 TUPLE: file-system-info device-name mount-point type free-space ;
 
 HOOK: file-system-info os ( path -- file-system-info )