diff --git a/wgpu-core/src/lib.rs b/wgpu-core/src/lib.rs
index 5bab0ee2a2..d76b02d9b1 100644
--- a/wgpu-core/src/lib.rs
+++ b/wgpu-core/src/lib.rs
@@ -54,6 +54,8 @@
 // this doesn't make a difference.
 // Therefore, this is only really a concern for users targeting WebGL
 // (the only reason to use wgpu-core on the web in the first place) that have atomics enabled.
+//
+// NOTE: Keep this in sync with `wgpu`.
 #![cfg_attr(not(send_sync), allow(clippy::arc_with_non_send_sync))]
 
 pub mod binding_model;
diff --git a/wgpu/src/lib.rs b/wgpu/src/lib.rs
index d45227dcf2..9361eb17d0 100644
--- a/wgpu/src/lib.rs
+++ b/wgpu/src/lib.rs
@@ -22,7 +22,8 @@
     rust_2018_idioms,
     unsafe_op_in_unsafe_fn
 )]
-#![allow(clippy::arc_with_non_send_sync)]
+// NOTE: Keep this in sync with `wgpu-core`.
+#![cfg_attr(not(send_sync), allow(clippy::arc_with_non_send_sync))]
 
 //
 //