diff --git a/js/common/view/PendulumSystemControlPanelNode.js b/js/common/view/PendulumSystemControlPanelNode.js
index f72d7fa..9279b8d 100644
--- a/js/common/view/PendulumSystemControlPanelNode.js
+++ b/js/common/view/PendulumSystemControlPanelNode.js
@@ -65,7 +65,8 @@ define( function( require ) {
               radius: 16,
               touchAreaDilation: 5
             } ),
-            new StepForwardButton( stepFunction, playProperty, {
+            new StepForwardButton( playProperty, {
+              listener: stepFunction,
               radius: 12,
               touchAreaDilation: 5
             } )