diff --git a/components/layout/fragment.rs b/components/layout/fragment.rs
index d4e3c6148fe..b2326c51efa 100644
--- a/components/layout/fragment.rs
+++ b/components/layout/fragment.rs
@@ -112,11 +112,6 @@ pub struct Fragment {
     pub debug_id: u16,
 }
 
-#[allow(unsafe_code)]
-unsafe impl Send for Fragment {}
-#[allow(unsafe_code)]
-unsafe impl Sync for Fragment {}
-
 impl Encodable for Fragment {
     fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
         e.emit_struct("fragment", 0, |e| {