diff --git a/extra/benchmark/reverse-complement/reverse-complement.factor b/extra/benchmark/reverse-complement/reverse-complement.factor
index 7de7ec24b4..4da3972e34 100644
--- a/extra/benchmark/reverse-complement/reverse-complement.factor
+++ b/extra/benchmark/reverse-complement/reverse-complement.factor
@@ -26,6 +26,8 @@ HINTS: do-trans-map string ;
         over push
     ] if ;
 
+HINTS: do-line vector string ;
+
 : (reverse-complement) ( seq -- )
     readln [ do-line (reverse-complement) ] [ show-seq ] if* ;