diff --git a/lib/cartodb/backends/template_maps.js b/lib/cartodb/backends/template_maps.js
index 812375e6..66d64dda 100644
--- a/lib/cartodb/backends/template_maps.js
+++ b/lib/cartodb/backends/template_maps.js
@@ -430,8 +430,8 @@ var _reNumber = /^([-+]?[\d\.]?\d+([eE][+-]?\d+)?)$/,
     _reCSSColorVal = /^#[0-9a-fA-F]{3,6}$/;
 
 function _replaceVars (str, params) {
-  // Construct regular expressions for each param
-  Object.keys(params).forEach(function(k) {
+    // Construct regular expressions for each param
+    Object.keys(params).forEach(function(k) {
         str = str.replace(new RegExp("<%=\\s*" + k + "\\s*%>", "g"), params[k]);
     });
     return str;
@@ -480,10 +480,10 @@ TemplateMaps.prototype.instance = function(template, params) {
   var layergroup = JSON.parse(JSON.stringify(template.layergroup));
 
   if (typeof layergroup.buffersize === 'string') {
-      layergroup.buffersize = Number(_replaceVars(layergroup.buffersize, all_params));
+      layergroup.buffersize = parseInt(_replaceVars(layergroup.buffersize, all_params), 10);
   } else if (isObject(layergroup.buffersize)) {
       Object.keys(layergroup.buffersize).forEach(function(k) {
-        layergroup.buffersize[k] = Number(_replaceVars(layergroup.buffersize[k], all_params));
+        layergroup.buffersize[k] = parseInt(_replaceVars(layergroup.buffersize[k], all_params), 10);
       });
   }