diff --git a/core/optimizer/def-use/def-use-tests.factor b/core/optimizer/def-use/def-use-tests.factor
index ef829da9f2..f49ab7fcba 100755
--- a/core/optimizer/def-use/def-use-tests.factor
+++ b/core/optimizer/def-use/def-use-tests.factor
@@ -1,6 +1,6 @@
 IN: optimizer.def-use.tests
 USING: inference inference.dataflow optimizer optimizer.def-use
-namespaces assocs kernel sequences math tools.test words ;
+namespaces assocs kernel sequences math tools.test words sets ;
 
 [ 3 { 1 1 1 } ] [
     [ 1 2 3 ] dataflow compute-def-use drop
diff --git a/extra/bank/bank.factor b/extra/bank/bank.factor
index 35d1337afc..abe3250ecf 100644
--- a/extra/bank/bank.factor
+++ b/extra/bank/bank.factor
@@ -26,8 +26,6 @@ C: <transaction> transaction
 : daily-rate>> ( account date -- rate )
     [ interest-rate>> ] dip daily-rate ;
 
-: before? ( date date -- ? ) <=> 0 < ;
-
 : transactions-on-date ( account date -- transactions )
     [ before? ] curry filter ;