diff --git a/less/buttons.less b/less/buttons.less
index 3fd1e95f5f..ada76ea223 100644
--- a/less/buttons.less
+++ b/less/buttons.less
@@ -78,7 +78,8 @@
   line-height: normal;
   .border-radius(5px);
 }
-.btn-large [class^="icon-"] {
+.btn-large [class^="icon-"],
+.btn-large [class*=" icon-"] {
   margin-top: 2px;
 }
 
@@ -88,7 +89,8 @@
   font-size: @baseFontSize - 2px;
   line-height: @baseLineHeight - 2px;
 }
-.btn-small [class^="icon-"] {
+.btn-small [class^="icon-"],
+.btn-small [class*=" icon-"] {
   margin-top: 0;
 }