diff --git a/less/mixins.less b/less/mixins.less
old mode 100644
new mode 100755
index 4f204d1af7..8f89beb794
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -596,6 +596,17 @@
     }
     .spanX (0) {}
 
+    .offsetX (@index) when (@index > 0) {
+      (~'.offset@{index}, .row-fluid .offset@{index}:first-child') { .offset(@index); }
+      .offsetX(@index - 1);
+    }
+    .offsetX (0) {}
+
+    .offset (@columns) {
+      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + @fluidGridGutterWidth;
+	  *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
+    }
+
     .span (@columns) {
       width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1));
       *width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%);
@@ -614,8 +625,9 @@
         margin-left: 0;
       }
 
-      // generate .spanX
+      // generate .spanX and .offsetX
       .spanX (@gridColumns);
+      .offsetX (@gridColumns);
     }
 
   }