2 files changed, 6 insertions, 2 deletions
diff --git a/src/0x.ts b/src/0x.ts
index d7a01ba70..6dfd1a8f5 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -199,8 +199,9 @@ export class ZeroEx {
         let msgHashHex;
         const nodeVersion = await this._web3Wrapper.getNodeVersionAsync();
         const isParityNode = utils.isParityNode(nodeVersion);
-        if (isParityNode) {
-            // Parity node adds the personalMessage prefix itself
+        const isTestRpc = utils.isTestRpc(nodeVersion);
+        if (isParityNode || isTestRpc) {
+            // Parity and TestRpc nodes add the personalMessage prefix itself
             msgHashHex = orderHash;
         } else {
             const orderHashBuff = ethUtil.toBuffer(orderHash);
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index bad5b6498..6f2d02a70 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -22,6 +22,9 @@ export const utils = {
     isParityNode(nodeVersion: string): boolean {
         return _.includes(nodeVersion, 'Parity');
     },
+    isTestRpc(nodeVersion: string): boolean {
+        return _.includes(nodeVersion, 'TestRPC');
+    },
     isValidOrderHash(orderHashHex: string): boolean {
         const isValid = /^0x[0-9A-F]{64}$/i.test(orderHashHex);
         return isValid;