diff --git a/src/Col.jsx b/src/Col.jsx
index 23f564c598..d7523ea6a7 100644
--- a/src/Col.jsx
+++ b/src/Col.jsx
@@ -46,19 +46,19 @@ var Col = React.createClass({
 
       prop = size + 'Offset';
       classPart = size + '-offset-';
-      if (this.props[prop]) {
+      if (this.props[prop] >= 0) {
         classes['col-' + classPart + this.props[prop]] = true;
       }
 
       prop = size + 'Push';
       classPart = size + '-push-';
-      if (this.props[prop]) {
+      if (this.props[prop] >= 0) {
         classes['col-' + classPart + this.props[prop]] = true;
       }
 
       prop = size + 'Pull';
       classPart = size + '-pull-';
-      if (this.props[prop]) {
+      if (this.props[prop] >= 0) {
         classes['col-' + classPart + this.props[prop]] = true;
       }
     }, this);
@@ -71,4 +71,4 @@ var Col = React.createClass({
   }
 });
 
-module.exports = Col;
\ No newline at end of file
+module.exports = Col;