diff --git a/src/geometry/Vertices.js b/src/geometry/Vertices.js
index 1dd769f..3b484b2 100644
--- a/src/geometry/Vertices.js
+++ b/src/geometry/Vertices.js
@@ -268,10 +268,11 @@ var Common = require('../core/Common');
      * @param {number} qualityMax
      */
     Vertices.chamfer = function(vertices, radius, quality, qualityMin, qualityMax) {
-        radius = radius || [8];
-
-        if (!radius.length)
+        if (typeof radius === 'number') {
             radius = [radius];
+        } else {
+            radius = radius || [8];
+        }
 
         // quality defaults to -1, which is auto
         quality = (typeof quality !== 'undefined') ? quality : -1;