diff --git a/source/index.ts b/source/index.ts
index b16ed6b..85535ba 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -1,5 +1,5 @@
 import type {Buffer} from 'node:buffer';
-import type {Class, Falsy, TypedArray, ObservableLike, Primitive} from './types.js';
+import type {Class, Falsy, TypedArray, ObservableLike, Primitive, WeakRef} from './types.js';
 
 const typedArrayTypeNames = [
 	'Int8Array',