diff --git a/src/buf.rs b/src/buf.rs
index a6cdc1e..ad41b4b 100644
--- a/src/buf.rs
+++ b/src/buf.rs
@@ -191,6 +191,7 @@ impl PartialEq for Buf {
 impl Eq for Buf {}
 
 unsafe impl Send for Buf {}
+unsafe impl Sync for Buf {}
 
 struct PoolInner {
     buf_capacity: usize,