diff --git a/lib/components/controls_component.html b/lib/components/controls_component.html
index 42e79f7..b4c43f3 100644
--- a/lib/components/controls_component.html
+++ b/lib/components/controls_component.html
@@ -1,7 +1,7 @@
 <div id="controls">
     <material-button id="reset" (click)="onResetClicked()"><material-icon icon="replay" baseline></material-icon></material-button>
     <material-button id="run" (click)="onStartClicked()">
-        <span [ngSwitch]="engine.isRunning">
+        <span [ngSwitch]="ctrl.isRunning">
             <material-icon *ngSwitchCase="false" icon="play_arrow" baseline></material-icon>
             <material-icon *ngSwitchCase="true" icon="pause" baseline></material-icon>
         </span>