diff --git a/examples/js/Mirror.js b/examples/js/Mirror.js
index e1a92501a1f401ebfca363e1dcf5455ce6cb32e4..1f901b4f186bdddd24b7c21787c233191f7eb751 100644
--- a/examples/js/Mirror.js
+++ b/examples/js/Mirror.js
@@ -186,13 +186,19 @@ THREE.Mirror = function ( width, height, options ) {
 
 		scope.visible = false;
 
-		var currentVrEnabled = renderer.vr.enabled;
 		var currentRenderTarget = renderer.getRenderTarget();
 
+		var currentVrEnabled = renderer.vr.enabled;
+		var currentShadowAutoUpdate = renderer.shadowMap.autoUpdate;
+
 		renderer.vr.enabled = false; // Avoid camera modification and recursion
+		renderer.shadowMap.autoUpdate = false; // Avoid re-computing shadows
+
 		renderer.render( scene, mirrorCamera, renderTarget, true );
 
 		renderer.vr.enabled = currentVrEnabled;
+		renderer.shadowMap.autoUpdate = currentShadowAutoUpdate;
+
 		renderer.setRenderTarget( currentRenderTarget );
 
 		scope.visible = true;