diff --git a/rust/nextpnr/src/lib.rs b/rust/nextpnr/src/lib.rs
index a025c13f..898a150f 100644
--- a/rust/nextpnr/src/lib.rs
+++ b/rust/nextpnr/src/lib.rs
@@ -438,9 +438,6 @@ pub struct Nets<'a> {
     _data: PhantomData<&'a Context>,
 }
 
-unsafe impl Send for Nets<'_> {}
-unsafe impl Sync for Nets<'_> {}
-
 impl<'a> Nets<'a> {
     /// Create a new store for the nets of a context.
     ///