diff --git a/addons/web/static/src/legacy/scss/bootstrap_overridden.scss b/addons/web/static/src/legacy/scss/bootstrap_overridden.scss
index ca6b4a282cc..230eaa29a72 100644
--- a/addons/web/static/src/legacy/scss/bootstrap_overridden.scss
+++ b/addons/web/static/src/legacy/scss/bootstrap_overridden.scss
@@ -23,6 +23,7 @@ $black:    #000 !default;
 
 $primary: $o-brand-primary !default;
 $secondary: $white !default;
+$dark: $o-gray-900 !default;
 
 $success: $o-success !default;
 $info: $o-info !default;