diff --git a/src/walker.rs b/src/walker.rs
index 9b8b4f5..0d8d4b2 100644
--- a/src/walker.rs
+++ b/src/walker.rs
@@ -28,7 +28,7 @@ pub struct WalkOptions<'a> {
     /// it should be included or not.
     ///
     /// This is passed to [`ignore::WalkBuilder::filter_entry`].
-    pub filter_fn: Option<Box<&'static FilterFn>>,
+    pub filter_fn: Option<&'static FilterFn>,
 }
 
 impl<'a> fmt::Debug for WalkOptions<'a> {