diff --git a/types/spark-md5/index.d.ts b/types/spark-md5/index.d.ts
index 9d5c76f7e2..c639e2edce 100644
--- a/types/spark-md5/index.d.ts
+++ b/types/spark-md5/index.d.ts
@@ -1,42 +1,47 @@
 // Type definitions for spark-md5 3.0
 // Project: https://github.com/satazor/js-spark-md5#readme
 // Definitions by: Bastien Moulia <https://github.com/bastienmoulia>
+//                 Florian Keller <https://github.com/ffflorian>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
-interface State {
-	buff: Uint8Array;
-	length: number;
-	hash: number[];
-}
-
 // copy of ArrayBuffer because of a conflict with the class SparkMD5.ArrayBuffer
-interface ArrayBufferCopy extends ArrayBuffer {}
+type JsArrayBuffer = ArrayBuffer;
 
 declare class SparkMD5 {
-	constructor();
-	append(str: string): SparkMD5;
-	appendBinary(contents: string): SparkMD5;
-	end(raw?: boolean): string;
-	reset(): SparkMD5;
-	getState(): State;
-	setState(state: State): State;
-	destroy(): void;
-	static hash(str: string, raw?: boolean): string;
-	static hashBinary(content: string, raw?: boolean): string;
+    constructor();
+
+    static hash(str: string, raw?: boolean): string;
+    static hashBinary(content: string, raw?: boolean): string;
+
+    append(str: string): SparkMD5;
+    appendBinary(contents: string): SparkMD5;
+    destroy(): void;
+    end(raw?: boolean): string;
+    getState(): SparkMD5.State;
+    reset(): SparkMD5;
+    setState(state: SparkMD5.State): SparkMD5.State;
 }
 
 declare namespace SparkMD5 {
-	class ArrayBuffer {
-		constructor();
-		append(str: ArrayBufferCopy): ArrayBuffer;
-		end(raw?: boolean): string;
-		reset(): ArrayBuffer;
-		getState(): State;
-		setState(state: State): State;
-		destroy(): void;
-		static hash(arr: ArrayBufferCopy, raw?: boolean): string;
-	}
+    interface State {
+        buff: Uint8Array;
+        hash: number[];
+        length: number;
+    }
+
+    class ArrayBuffer {
+        constructor();
+
+        static hash(arr: JsArrayBuffer, raw?: boolean): string;
+
+        append(str: JsArrayBuffer): ArrayBuffer;
+        destroy(): void;
+        end(raw?: boolean): string;
+        getState(): State;
+        reset(): ArrayBuffer;
+        setState(state: State): State;
+    }
 }
 
 export = SparkMD5;
diff --git a/types/spark-md5/spark-md5-tests.ts b/types/spark-md5/spark-md5-tests.ts
index 6986ee2e89..f230db283f 100644
--- a/types/spark-md5/spark-md5-tests.ts
+++ b/types/spark-md5/spark-md5-tests.ts
@@ -1,8 +1,8 @@
-import SparkMD5 = require("spark-md5");
+import SparkMD5 = require('spark-md5');
 
 SparkMD5.hash('Hi there');
 SparkMD5.hash('Hi there', true);
-SparkMD5.hashBinary("");
+SparkMD5.hashBinary('');
 
 const spark = new SparkMD5();
 spark.append('Hi');
diff --git a/types/spark-md5/tsconfig.json b/types/spark-md5/tsconfig.json
index 8eac67ed47..bd3c3435d2 100644
--- a/types/spark-md5/tsconfig.json
+++ b/types/spark-md5/tsconfig.json
@@ -20,4 +20,4 @@
         "index.d.ts",
         "spark-md5-tests.ts"
     ]
-}
\ No newline at end of file
+}