diff --git a/less/forms.less b/less/forms.less
index 3138c2c518..0017dfd41d 100644
--- a/less/forms.less
+++ b/less/forms.less
@@ -198,7 +198,7 @@ input[type="search"] {
 // horizontal forms, use the predefined grid classes.
 
 .form-group {
-  margin-bottom: 15px;
+  margin-bottom: @form-group-margin-bottom;
 }