diff --git a/src/submission/NodeSubmissionAdapter.ts b/src/submission/NodeSubmissionAdapter.ts
index 247f4106..1fb8b0d7 100644
--- a/src/submission/NodeSubmissionAdapter.ts
+++ b/src/submission/NodeSubmissionAdapter.ts
@@ -30,7 +30,7 @@ export class NodeSubmissionAdapter implements ISubmissionAdapter {
     if (request.method === 'POST') {
       options.headers = {
         'Content-Type': 'application/json',
-        'Content-Length': request.data.length
+        'Content-Length': new Buffer(request.data).length
       };
     }