diff --git a/src/splitting.rs b/src/splitting.rs
index fbb06396..01e905f3 100644
--- a/src/splitting.rs
+++ b/src/splitting.rs
@@ -30,20 +30,13 @@ pub trait WordSplitter: std::fmt::Debug {
     fn split_points(&self, word: &str) -> Vec<usize>;
 }
 
-impl WordSplitter for Box<dyn WordSplitter> {
+impl<S: WordSplitter + ?Sized> WordSplitter for Box<S> {
     fn split_points(&self, word: &str) -> Vec<usize> {
         use std::ops::Deref;
         self.deref().split_points(word)
     }
 }
-/* Alternative, also adds impls for specific Box<S> i.e. Box<HyphenSplitter>
-impl<S: WordSplitter + ?Sized> WordSplitter for Box<S> {
-    fn split<'w>(&self, word: &'w str) -> Vec<(&'w str, &'w str, &'w str)> {
-        use std::ops::Deref;
-        self.deref().split(word)
-    }
-}
-*/
+
 impl<T: ?Sized + WordSplitter> WordSplitter for &T {
     fn split_points(&self, word: &str) -> Vec<usize> {
         (*self).split_points(word)