diff --git a/scss/bootstrap/_variables.scss b/scss/bootstrap/_variables.scss
index 62aaf18..96c873b 100644
--- a/scss/bootstrap/_variables.scss
+++ b/scss/bootstrap/_variables.scss
@@ -49,7 +49,7 @@ $table-hover-bg-factor: .03 !default;
 // Buttons + Forms
 
 // Buttons
-$btn-box-shadow: null;
+$btn-box-shadow: none;
 $enable-gradients: true;
 $btn-transition: none;