2 files changed, 6 insertions, 7 deletions
diff --git a/src/ts/0x.js.ts b/src/ts/0x.js.ts
index 1f9ea5f9b..89d049bec 100644
--- a/src/ts/0x.js.ts
+++ b/src/ts/0x.js.ts
@@ -19,12 +19,12 @@ export class ZeroEx {
      * Verifies that the elliptic curve signature `signature` was generated
      * by signing `data` with the private key corresponding to the `signer` address.
      */
-    public static isValidSignature(data: HexString, signature: ECSignature, signer: ETHAddressHex): boolean {
-        assert.isString('data', data);
+    public static isValidSignature(dataHex: string, signature: ECSignature, signer: ETHAddressHex): boolean {
+        assert.isHexString('dataHex', dataHex);
         assert.isObject('signature', signature);
         assert.isETHAddressHex('signer', signer);
 
-        const dataBuff = ethUtil.toBuffer(data);
+        const dataBuff = ethUtil.toBuffer(dataHex);
         const msgHashBuff = ethUtil.hashPersonalMessage(dataBuff);
         try {
             const pubKey = ethUtil.ecrecover(msgHashBuff,
@@ -51,7 +51,7 @@ export class ZeroEx {
         return salt;
     }
     /** Checks if order hash is valid */
-    public static isValidOrderHash(orderHash: HexString): boolean {
+    public static isValidOrderHash(orderHash: string): boolean {
         assert.isHexString('orderHash', orderHash);
         return orderHash.length === ORDER_HASH_LENGTH;
     }
diff --git a/src/ts/globals.d.ts b/src/ts/globals.d.ts
index 9b81e15bd..c9cc0d481 100644
--- a/src/ts/globals.d.ts
+++ b/src/ts/globals.d.ts
@@ -1,12 +1,11 @@
 declare type ETHPublicKey = string;
 declare type ETHAddressHex = string;
-declare type HexString = string;
 declare type ETHAddressBuff = Buffer;
 
 declare module 'ethereumjs-util' {
-    const toBuffer: (data: HexString) => Buffer;
+    const toBuffer: (dataHex: string) => Buffer;
     const hashPersonalMessage: (msg: Buffer) => Buffer;
-    const bufferToHex: (buff: Buffer) => HexString;
+    const bufferToHex: (buff: Buffer) => string;
     const ecrecover: (msgHashBuff: Buffer, v: number, r: Buffer, s: Buffer) => ETHPublicKey;
     const pubToAddress: (pubKey: ETHPublicKey) => ETHAddressBuff;
 }