diff --git a/types/circular-json/circular-json-tests.ts b/types/circular-json/circular-json-tests.ts
index 41ec8f0a36..786ec5cec6 100644
--- a/types/circular-json/circular-json-tests.ts
+++ b/types/circular-json/circular-json-tests.ts
@@ -1,14 +1,10 @@
-
 import CircularJSON = require('circular-json');
 
-var replacer = (key: any, val: any) => {
+const replacer = (key: any, val: any) => {
   return val;
-}
+};
 
-var replacerArray = ['a', 'x'];
-
-// implements JSON interface
-var json_obj: JSON = CircularJSON;
+const replacerArray = ['a', 'x'];
 
 CircularJSON.parse('{"a":"b"}');
 
diff --git a/types/circular-json/index.d.ts b/types/circular-json/index.d.ts
index 1b4e5c1d2b..ce94972de4 100644
--- a/types/circular-json/index.d.ts
+++ b/types/circular-json/index.d.ts
@@ -1,14 +1,7 @@
-// Type definitions for circular-json v0.1.6
+// Type definitions for circular-json 0.4
 // Project: https://github.com/WebReflection/circular-json
 // Definitions by: Jonathan Pevarnek <https://github.com/jpevarnek>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-
-interface ICircularJSON extends JSON {
-    parse(text: string, reviver?: (key: any, value: any) => any): any;
-    stringify(value: any, replacer?: ((key: string, value: any) => any) | any[], space?: any, placeholder?: boolean): string;
-}
-
-declare var CircularJSON: ICircularJSON;
-
-export = CircularJSON;
+export function parse(text: string, reviver?: (key: any, value: any) => any): any;
+export function stringify(value: any, replacer?: ((key: string, value: any) => any) | Array<number | string> | null, space?: any, placeholder?: boolean): string;
diff --git a/types/circular-json/tslint.json b/types/circular-json/tslint.json
new file mode 100644
index 0000000000..b4b47a0378
--- /dev/null
+++ b/types/circular-json/tslint.json
@@ -0,0 +1,3 @@
+{
+	"extends": "dtslint/dt.json"
+}