diff --git a/types/lib/legacy/polymer.dom.d.ts b/types/lib/legacy/polymer.dom.d.ts
index fcb45e7f2e..e0992bfe64 100644
--- a/types/lib/legacy/polymer.dom.d.ts
+++ b/types/lib/legacy/polymer.dom.d.ts
@@ -47,11 +47,6 @@ declare namespace Polymer {
      */
     readonly activeElement: Node|null|undefined;
 
-    /**
-     * @param node Node for which to create a Polymer.dom helper object.
-     */
-    constructor(node: Node|null);
-
     /**
      * Returns an instance of `Polymer.FlattenedNodesObserver` that
      * listens for node changes on this element.
@@ -181,5 +176,4 @@ declare class EventApi {
    * Returns the `composedPath` for this event.
    */
   readonly path: EventTarget[];
-  constructor(event: any);
 }
diff --git a/types/lib/utils/debounce.d.ts b/types/lib/utils/debounce.d.ts
index 80728e08bb..d8ee1eabc2 100644
--- a/types/lib/utils/debounce.d.ts
+++ b/types/lib/utils/debounce.d.ts
@@ -15,7 +15,6 @@
 declare namespace Polymer {
 
   class Debouncer {
-    constructor();
 
     /**
      * Creates a debouncer if no debouncer is passed as a parameter
diff --git a/types/lib/utils/flattened-nodes-observer.d.ts b/types/lib/utils/flattened-nodes-observer.d.ts
index e02f483b92..32915b4bd3 100644
--- a/types/lib/utils/flattened-nodes-observer.d.ts
+++ b/types/lib/utils/flattened-nodes-observer.d.ts
@@ -54,13 +54,6 @@ declare namespace Polymer {
    */
   class FlattenedNodesObserver {
 
-    /**
-     * @param target Node on which to listen for changes.
-     * @param callback Function called when there are additions
-     * or removals from the target's list of flattened nodes.
-     */
-    constructor(target: _Element|null, callback: ((p0: _Element, p1: {target: _Element, addedNodes: _Element[], removedNodes: _Element[]}) => void)|null);
-
     /**
      * Returns the list of flattened nodes for the given `node`.
      * This list consists of a node's children and, for any children
diff --git a/types/lib/utils/html-tag.d.ts b/types/lib/utils/html-tag.d.ts
index 7c20bf1bc8..5c138ccc6e 100644
--- a/types/lib/utils/html-tag.d.ts
+++ b/types/lib/utils/html-tag.d.ts
@@ -17,7 +17,6 @@
  */
 declare class LiteralString {
   value: string;
-  constructor(string: any);
 
   /**
    * @returns LiteralString string value