diff --git a/src/lib.rs b/src/lib.rs
index 85581997ff46e90454813126b37f37779e33c86e..039b18e73e272ebba862353422dcdb8ea8b9e28e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -116,4 +116,3 @@ impl Threshold {
     }
 }
 
-unsafe impl Sync for Threshold {}