diff --git a/less/button-groups.less b/less/button-groups.less
index c253576225..cbe03f7421 100644
--- a/less/button-groups.less
+++ b/less/button-groups.less
@@ -178,7 +178,8 @@
 
 .btn-group-vertical {
   > .btn,
-  > .btn-group {
+  > .btn-group,
+  > .btn-group > .btn {
     display: block;
     float: none;
     width: 100%;