diff --git a/src/handler.rs b/src/handler.rs
index 3ac0c2ab2..661cd0285 100644
--- a/src/handler.rs
+++ b/src/handler.rs
@@ -353,13 +353,16 @@ impl<T, E: Into<Error>> From<Result<T, E>> for AsyncResult<T> {
     }
 }
 
-impl<T, E: Into<Error>> From<Result<Box<Future<Item = T, Error = Error>>, E>>
-    for AsyncResult<T>
+impl<T, E> From<Result<Box<Future<Item = T, Error = E>>, E>> for AsyncResult<T>
+where T: 'static,
+      E: Into<Error> + 'static
 {
     #[inline]
-    fn from(res: Result<Box<Future<Item = T, Error = Error>>, E>) -> Self {
+    fn from(res: Result<Box<Future<Item = T, Error = E>>, E>) -> Self {
         match res {
-            Ok(fut) => AsyncResult(Some(AsyncResultItem::Future(fut))),
+            Ok(fut) => AsyncResult(
+                Some(AsyncResultItem::Future(
+                    Box::new(fut.map_err(|e| e.into()))))),
             Err(err) => AsyncResult(Some(AsyncResultItem::Err(err.into()))),
         }
     }