diff --git a/tasks/test_amdefine.js b/tasks/test_amdefine.js
index 0da4ee86a93..7f343e7a775 100644
--- a/tasks/test_amdefine.js
+++ b/tasks/test_amdefine.js
@@ -16,7 +16,7 @@ if(typeof define !== 'function') {
 define(function(require) {
     var plotly = require('../dist/plotly.min.js');
 
-    if(plotly) {
+    if(plotly && plotly.PlotSchema) {
         console.log(plotly);
     } else {
         throw 'Error: loading with amdefine';
diff --git a/tasks/test_requirejs.js b/tasks/test_requirejs.js
index 4ec56da300e..a3a39494e89 100644
--- a/tasks/test_requirejs.js
+++ b/tasks/test_requirejs.js
@@ -18,7 +18,7 @@ requirejs.config({
 
 requirejs(['plotly'],
 function(plotly) {
-    if(plotly) {
+    if(plotly && plotly.PlotSchema) {
         console.log(plotly);
     } else {
         throw 'Error: loading with requirejs';