diff --git a/types/polymer/index.d.ts b/types/polymer/index.d.ts
index 936d3362f4..c206c08927 100644
--- a/types/polymer/index.d.ts
+++ b/types/polymer/index.d.ts
@@ -341,6 +341,8 @@ declare global {
 
       RenderStatus: RenderStatus
 
+      ArraySplice: ArraySplice;
+
       /** @deprecated */
       ImportStatus: ImportStatus
     }