diff --git a/types/ejs/ejs-tests.ts b/types/ejs/ejs-tests.ts
index 8c6dae9965..40c610dd59 100644
--- a/types/ejs/ejs-tests.ts
+++ b/types/ejs/ejs-tests.ts
@@ -1,5 +1,7 @@
 import ejs = require("ejs");
 import * as fs from 'graceful-fs';
+import LRU = require("lru-cache");
+import { TemplateFunction } from "ejs";
 
 const fileName = 'test.ejs';
 const people = ['geddy', 'neil', 'alex'];
@@ -33,3 +35,5 @@ ejs.compile(template, options);
 ejs.fileLoader = (str: string) => str;
 
 ejs.clearCache();
+
+ejs.cache = LRU(100);
diff --git a/types/ejs/index.d.ts b/types/ejs/index.d.ts
index 771ab220e6..9d1294e681 100644
--- a/types/ejs/index.d.ts
+++ b/types/ejs/index.d.ts
@@ -107,8 +107,7 @@ export function escapeRegexChars(s: string): string;
  */
 export function escapeXML(markup: string): string;
 export interface Cache {
-    _data: { [name: string]: TemplateFunction; };
-    set(key: string, val: TemplateFunction): TemplateFunction;
+    set(key: string, val: TemplateFunction): void;
     get(key: string): TemplateFunction;
 }
 export let delimiter: string;