diff --git a/lib/OpenLayers/BaseTypes.js b/lib/OpenLayers/BaseTypes.js
index b5735b8f0d..120b7c03d4 100644
--- a/lib/OpenLayers/BaseTypes.js
+++ b/lib/OpenLayers/BaseTypes.js
@@ -125,12 +125,17 @@ String.prototype.camelize = function() {
  *           If null, 0, or negative value passed in, returns 0
  */
 Number.prototype.limitSigDigs = function(sig) {
-    var number = (sig > 0) ? this.toString() : 0;
-    if (sig < number.length) {
-        var exp = number.length - sig;
-        number = Math.round( this / Math.pow(10, exp)) * Math.pow(10, exp);
+    var numStr = (sig > 0) ? this.toString() : "0";
+    if (numStr.contains(".")) {
+        var msg = "limitSigDig can not be called on a floating point number";
+        OpenLayers.Console.error(msg);
+        return null;
     }
-    return parseInt(number);
+    if ( (sig > 0) && (sig < numStr.length) ) {
+        var exp = numStr.length - sig;
+        numStr = Math.round( this / Math.pow(10, exp)) * Math.pow(10, exp);
+    }
+    return parseInt(numStr);
 }