diff --git a/basis/tools/ps/linux/linux.factor b/basis/tools/ps/linux/linux.factor
index 016d3d51ac..b7e327cb2e 100644
--- a/basis/tools/ps/linux/linux.factor
+++ b/basis/tools/ps/linux/linux.factor
@@ -1,7 +1,8 @@
 ! Copyright (C) 2012 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors assocs io.directories io.pathnames kernel
-math.parser prettyprint sequences splitting unix.linux.proc ;
+math.parser prettyprint sequences splitting system
+unix.linux.proc ;
 IN: tools.ps.linux
 
 ! If cmdline is empty, read the filename from /proc/pid/stat