diff --git a/extra/tools/time/struct/struct.factor b/extra/tools/time/struct/struct.factor
index 1f63fc0528..022124cc12 100644
--- a/extra/tools/time/struct/struct.factor
+++ b/extra/tools/time/struct/struct.factor
@@ -1,7 +1,7 @@
 ! Copyright (C) 2010 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors alien.c-types classes.struct kernel memory
-system vm ;
+tools.memory system vm ;
 IN: tools.time.struct
 
 STRUCT: benchmark-data