diff --git a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
index 4d2d926f12..3f02880ae3 100644
--- a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
+++ b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
@@ -41,7 +41,7 @@ ol.renderer.canvas.VectorLayer = function(mapRenderer, layer) {
    * @type {CanvasRenderingContext2D}
    */
   this.context_ =  /** @type {CanvasRenderingContext2D} */
-      this.canvas_.getContext('2d');
+      (this.canvas_.getContext('2d'));
 
   /**
    * @private
@@ -254,7 +254,7 @@ ol.renderer.canvas.VectorLayer.prototype.renderFrame =
 
   if (goog.isNull(this.tileArchetype_)) {
     this.tileArchetype_ = /** @type {HTMLCanvasElement} */
-        goog.dom.createElement(goog.dom.TagName.CANVAS);
+        (goog.dom.createElement(goog.dom.TagName.CANVAS));
     this.tileArchetype_.width = tileSize.width;
     this.tileArchetype_.height = tileSize.height;
   }
@@ -363,7 +363,7 @@ ol.renderer.canvas.VectorLayer.prototype.renderFrame =
       tile = /** @type {HTMLCanvasElement} */ (this.tileCache_.get(key));
     } else {
       tile = /** @type {HTMLCanvasElement} */
-          this.tileArchetype_.cloneNode(false);
+          (this.tileArchetype_.cloneNode(false));
       tile.getContext('2d').drawImage(sketchCanvas,
           (tileRange.minX - tileCoord.x) * tileSize.width,
           (tileCoord.y - tileRange.maxY) * tileSize.height);
diff --git a/src/ol/structs/rtree.js b/src/ol/structs/rtree.js
index d3e22e1992..2f316cb095 100644
--- a/src/ol/structs/rtree.js
+++ b/src/ol/structs/rtree.js
@@ -133,7 +133,7 @@ ol.structs.RTreeNode_.prototype.divide = function() {
       goog.object.extend(this.types, node.types);
       this.children.push(node);
     }
-    child.parent = /** @type {ol.structs.RTreeNode_} */ node;
+    child.parent = /** @type {ol.structs.RTreeNode_} */ (node);
     goog.object.extend(node.types, child.types);
     node.children.push(child);
     node.extend(child);
@@ -164,7 +164,7 @@ ol.structs.RTree = function() {
  * @return {Object.<string, Object>} Results for the passed bounding box.
  */
 ol.structs.RTree.prototype.find = function(bounds, opt_type) {
-  var results = /** @type {Object.<string, Object>} */ {};
+  var results = /** @type {Object.<string, Object>} */ ({});
   this.root_.find(bounds, results, opt_type);
   return results;
 };