diff --git a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
index 167071625f..7a8f5cbb85 100644
--- a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
+++ b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
@@ -331,8 +331,7 @@ ol.renderer.canvas.VectorLayer.prototype.renderFrame =
    * necessary.  And look for ways to get here faster.
    */
   if (!this.dirty_ && this.renderedResolution_ === tileResolution &&
-      // TODO: extent.equals()
-      this.renderedExtent_.toString() === tileRangeExtent.toString()) {
+      ol.extent.equals(this.renderedExtent_, tileRangeExtent)) {
     return;
   }