diff --git a/src/boxed.rs b/src/boxed.rs
index 2bcbefe..55caac3 100644
--- a/src/boxed.rs
+++ b/src/boxed.rs
@@ -25,9 +25,9 @@ where
 {
     /// Creates a new `BoxPredicate`, a wrapper around a dynamically-dispatched
     /// `Predicate` type with useful trait impls.
-    pub fn new<P: Predicate<Item>>(inner: P) -> BoxPredicate<Item>
+    pub fn new<P>(inner: P) -> BoxPredicate<Item>
     where
-        P: Send + Sync + 'static,
+        P: Predicate<Item> + Send + Sync + 'static,
     {
         BoxPredicate(Box::new(inner))
     }