diff --git a/src/socket/set.rs b/src/socket/set.rs
index 9c81aee86..b41a5383c 100644
--- a/src/socket/set.rs
+++ b/src/socket/set.rs
@@ -16,7 +16,7 @@ pub struct Item<'a, 'b: 'a> {
 }
 
 /// A handle, identifying a socket in a set.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Default, Hash)]
 pub struct Handle(usize);
 
 impl fmt::Display for Handle {