diff --git a/js/Axis.js b/js/Axis.js
index <HASH>..<HASH> 100644
--- a/js/Axis.js
+++ b/js/Axis.js
@@ -53,6 +53,10 @@ Axis.prototype = {
         this._calculateTicks();
       }
     }
+
+    // Ticks to strings
+    _.each(this.ticks, function (tick) { tick.label += ''; });
+    _.each(this.minorTicks, function (tick) { tick.label += ''; });
   },
 
   /**
Cast ticks to strings.

Ensure ticks are strings before proceding.  Tick formatters may return a
number.  We should not blow up because of this.  Fixes #<I>.