diff --git a/src/lib.rs b/src/lib.rs
index 6e9ce86..a071d93 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -150,9 +150,9 @@ lazy_static! {
 
 pub struct TTS(Box<dyn Backend>);
 
-unsafe impl std::marker::Send for TTS {}
+unsafe impl Send for TTS {}
 
-unsafe impl std::marker::Sync for TTS {}
+unsafe impl Sync for TTS {}
 
 impl TTS {
     /**