diff --git a/extra/forestdb/paths/paths.factor b/extra/forestdb/paths/paths.factor
index 038b4c733d..d27af11e6a 100644
--- a/extra/forestdb/paths/paths.factor
+++ b/extra/forestdb/paths/paths.factor
@@ -2,7 +2,7 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: arrays combinators.short-circuit combinators.smart
 io.directories io.pathnames kernel math math.parser sequences
-sorting sorting.human splitting ;
+sorting sorting.human splitting sets ;
 IN: forestdb.paths
 
 CONSTANT: fdb-filename-base "fq"