2 files changed, 20 insertions, 1 deletions
diff --git a/packages/website/ts/blockchain.ts b/packages/website/ts/blockchain.ts
index d310464ed..d7c23205d 100644
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -421,8 +421,21 @@ export class Blockchain {
         if (_.isUndefined(makerAddress)) {
             throw new Error('Tried to send a sign request but user has no associated addresses');
         }
+
         this._showFlashMessageIfLedger();
-        const ecSignature = await this._zeroEx.signOrderHashAsync(orderHash, makerAddress);
+        const nodeVersion = await this._web3Wrapper.getNodeVersionAsync();
+        const isParityNode = utils.isParityNode(nodeVersion);
+        const isTestRpc = utils.isTestRpc(nodeVersion);
+        const isLedgerSigner = !_.isUndefined(this._ledgerSubprovider);
+        let shouldAddPersonalMessagePrefix = true;
+        if ((isParityNode && !isLedgerSigner) || isTestRpc || isLedgerSigner) {
+            shouldAddPersonalMessagePrefix = false;
+        }
+        const ecSignature = await this._zeroEx.signOrderHashAsync(
+            orderHash,
+            makerAddress,
+            shouldAddPersonalMessagePrefix,
+        );
         const signatureData = _.extend({}, ecSignature, {
             hash: orderHash,
         });
diff --git a/packages/website/ts/utils/utils.ts b/packages/website/ts/utils/utils.ts
index 23db8c0a7..003ecd30a 100644
--- a/packages/website/ts/utils/utils.ts
+++ b/packages/website/ts/utils/utils.ts
@@ -276,4 +276,10 @@ export const utils = {
             exchangeContractErrorToHumanReadableError[error] || ZeroExErrorToHumanReadableError[error];
         return humanReadableErrorMsg;
     },
+    isParityNode(nodeVersion: string): boolean {
+        return _.includes(nodeVersion, 'Parity');
+    },
+    isTestRpc(nodeVersion: string): boolean {
+        return _.includes(nodeVersion, 'TestRPC');
+    },
 };