diff --git a/src/db.rs b/src/db.rs
index 8886427..4839189 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -185,7 +185,6 @@ pub struct DBIterator {
 }
 
 unsafe impl Send for DBIterator {}
-unsafe impl Sync for DBIterator {}
 
 pub enum Direction {
     Forward,