diff --git a/2017/src/day04.clj b/2017/src/day04.clj
index 369101a..e8ae965 100644
--- a/2017/src/day04.clj
+++ b/2017/src/day04.clj
@@ -12,8 +12,7 @@
 
 ;; part 2
 (->> input
-     (filter (fn [l]
-               (= (count (into #{} (map frequencies l)))
-                  (count l))))
+     (filter #(= (count (into #{} (map frequencies %)))
+                 (count %)))
      count)