diff --git a/framework/core/less/lib/variables.less b/framework/core/less/lib/variables.less
index d8df67906..2bfca83a5 100644
--- a/framework/core/less/lib/variables.less
+++ b/framework/core/less/lib/variables.less
@@ -88,6 +88,7 @@
 @text-color:            @fl-body-color;
 @legend-color:          @fl-body-color;
 @font-size-base:        13px;
+@headings-line-height:  1.428571429;
 
 @font-family-sans-serif: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;