diff --git a/src/poll.rs b/src/poll.rs
index f4344b7f..b16ae7bb 100644
--- a/src/poll.rs
+++ b/src/poll.rs
@@ -310,3 +310,6 @@ impl Drop for PollWatcher {
         }
     }
 }
+
+// Because all public methods are `&mut self` it's also perfectly safe to share references.
+unsafe impl Sync for PollWatcher {}