diff --git a/js/symbol/bin_pack.js b/js/symbol/bin_pack.js
index 51119d71f9a..86fa1d13674 100644
--- a/js/symbol/bin_pack.js
+++ b/js/symbol/bin_pack.js
@@ -55,7 +55,7 @@ BinPack.prototype.allocate = function(width, height) {
 
     if (smallest < 0) {
         // There's no space left for this char.
-        return { x: -1, y: -1 };
+        return { x: -1, y: -1, w: 0, h: 0 };
     }
 
     this.free.splice(smallest, 1);
diff --git a/js/symbol/sprite_atlas.js b/js/symbol/sprite_atlas.js
index 41004b58e5c..f588e542140 100644
--- a/js/symbol/sprite_atlas.js
+++ b/js/symbol/sprite_atlas.js
@@ -119,6 +119,7 @@ SpriteAtlas.prototype.allocateImage = function(pixelWidth, pixelHeight) {
     // Add a 1px border around every image.
     var rect = this.bin.allocate(packWidth, packHeight);
     if (rect.w === 0) {
+        console.warn('SpriteAtlas out of space.');
         return rect;
     }