diff --git a/less/buttons.less b/less/buttons.less
index 8905ffa4a5..e53b0132fc 100644
--- a/less/buttons.less
+++ b/less/buttons.less
@@ -123,14 +123,14 @@
 .btn-large {
   padding: @padding-large-vertical @padding-large-horizontal;
   font-size: @font-size-large;
-  line-height: 1.33; // ensure even-numbered height of button next to large input
+  line-height: @line-height-large; // ensure even-numbered height of button next to large input
   border-radius: @border-radius-large;
 }
 .btn-small,
 .btn-mini {
   padding: @padding-small-vertical @padding-small-horizontal;
   font-size: @font-size-small;
-  line-height: 1.5; // ensure proper height of button next to small input
+  line-height: @line-height-small; // ensure proper height of button next to small input
   border-radius: @border-radius-small;
 }
 .btn-mini {