diff --git a/web/page_view.js b/web/page_view.js
index 388e1c629..07149add1 100644
--- a/web/page_view.js
+++ b/web/page_view.js
@@ -462,7 +462,7 @@ var PageView = function pageView(container, id, scale,
     this.canvas = canvas;
 
     var scale = this.scale;
-    var ctx = canvas.getContext('2d', {alpha: false});
+    var ctx = canvas.getContext('2d');
     var outputScale = getOutputScale(ctx);
 
     if (USE_ONLY_CSS_ZOOM) {
diff --git a/web/text_layer_builder.js b/web/text_layer_builder.js
index c2ed65a14..bd75abf63 100644
--- a/web/text_layer_builder.js
+++ b/web/text_layer_builder.js
@@ -53,7 +53,7 @@ var TextLayerBuilder = function textLayerBuilder(options) {
   this.renderLayer = function textLayerBuilderRenderLayer() {
     var textDivs = this.textDivs;
     var canvas = document.createElement('canvas');
-    var ctx = canvas.getContext('2d', {alpha: false});
+    var ctx = canvas.getContext('2d');
 
     // No point in rendering so many divs as it'd make the browser unusable
     // even after the divs are rendered
diff --git a/web/thumbnail_view.js b/web/thumbnail_view.js
index cd3da4b7c..90d4e89f6 100644
--- a/web/thumbnail_view.js
+++ b/web/thumbnail_view.js
@@ -111,7 +111,7 @@ var ThumbnailView = function thumbnailView(container, id, defaultViewport) {
 
     ring.appendChild(canvas);
 
-    var ctx = canvas.getContext('2d', {alpha: false});
+    var ctx = canvas.getContext('2d');
     ctx.save();
     ctx.fillStyle = 'rgb(255, 255, 255)';
     ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight);