diff --git a/types/polymer/index.d.ts b/types/polymer/index.d.ts
index 3392f7c7e3..eccf02fbca 100644
--- a/types/polymer/index.d.ts
+++ b/types/polymer/index.d.ts
@@ -281,8 +281,6 @@ declare global {
       observeNodes(callback: (info: ObservedNodeInfo) => void): {};
 
       unobserveNodes(observer: {}): void;
-        
-      getEffectiveChildren(): Node[];
 
       getEffectiveChildNodes(): Node[];