diff --git a/core/instances.ts b/core/instances.ts
index 5ff4a41e18..8293708a4f 100644
--- a/core/instances.ts
+++ b/core/instances.ts
@@ -1 +1,3 @@
-export default new WeakMap();
+import type Quill from '../core';
+
+export default new WeakMap<Node, Quill>();