diff --git a/lib/browser/rpc.js b/lib/browser/rpc.js
index e77a2f56..427df21e 100644
--- a/lib/browser/rpc.js
+++ b/lib/browser/rpc.js
@@ -179,7 +179,12 @@ function makeRequest(url, data) {
     // The global __debug__ object is provided by Visual Studio Code.
     if (global.__debug__) {
         let request = global.__debug__.require('sync-request');
-        let response = request('POST', url, {json: data});
+        let response = request('POST', url, {
+          body: JSON.stringify(data),
+          headers: {
+            "Content-Type": "text/plain;charset=UTF-8"
+          }
+        });
 
         statusCode = response.statusCode;
         responseText = response.body.toString('utf-8');