diff --git a/src/filters/trace.rs b/src/filters/trace.rs
index 8e6bb1c98..74abbe80f 100644
--- a/src/filters/trace.rs
+++ b/src/filters/trace.rs
@@ -209,18 +209,6 @@ impl<'a> Info<'a> {
     }
 }
 
-struct OptFmt<T>(Option<T>);
-
-impl<T: fmt::Display> fmt::Display for OptFmt<T> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        if let Some(ref t) = self.0 {
-            fmt::Display::fmt(t, f)
-        } else {
-            f.write_str("-")
-        }
-    }
-}
-
 mod internal {
     use futures::{future::Inspect, future::MapOk, FutureExt, TryFutureExt};