diff --git a/src/lib.rs b/src/lib.rs
index bdd1045..c77570c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -575,6 +575,8 @@ specifiers and other APIs.
 #![warn(missing_debug_implementations)]
 // Document ALL THE THINGS!
 #![deny(missing_docs)]
+// See: https://github.com/rust-lang/rust/pull/121364
+#![allow(ambiguous_negative_literals)]
 
 // It should be possible to support other pointer widths, but this library
 // hasn't been tested nor thought about much in contexts with pointers less
diff --git a/tests/lib.rs b/tests/lib.rs
index 9820dc2..1377885 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -1 +1,4 @@
+// See: https://github.com/rust-lang/rust/pull/121364
+#![allow(ambiguous_negative_literals)]
+
 mod tc39_262;