diff --git a/src/functionHelper.js b/src/functionHelper.js
index 60e0634dc..8ac697580 100644
--- a/src/functionHelper.js
+++ b/src/functionHelper.js
@@ -32,7 +32,7 @@ function runProxyHandler(funOptions, options) {
     let results = '';
     let hasDetectedJson = false;
 
-    process.stdout.on('data', data => {
+    process.stdin.on('data', data => {
       let str = data.toString('utf8');
 
       if (hasDetectedJson) {