diff --git a/bios/common/src/racy_cell.rs b/bios/common/src/racy_cell.rs
index d2797f7b..439d1b18 100644
--- a/bios/common/src/racy_cell.rs
+++ b/bios/common/src/racy_cell.rs
@@ -18,4 +18,4 @@ impl<T> RacyCell<T> {
 }
 
 unsafe impl<T> Send for RacyCell<T> where T: Send {}
-unsafe impl<T> Sync for RacyCell<T> {}
+unsafe impl<T: Sync> Sync for RacyCell<T> {}