diff --git a/less/buttons.less b/less/buttons.less
index 490c74a7bd..85f18ff0cc 100644
--- a/less/buttons.less
+++ b/less/buttons.less
@@ -171,11 +171,11 @@ input[type="submit"].btn {
   // IE7 has some default padding on button controls
   *padding-top: 2px;
   *padding-bottom: 2px;
-  &.large {
+  &.btn-large {
     *padding-top: 7px;
     *padding-bottom: 7px;
   }
-  &.small {
+  &.btn-small {
     *padding-top: 3px;
     *padding-bottom: 3px;
   }