diff --git a/addons/web/static/src/scss/bs_mixins_overrides.scss b/addons/web/static/src/scss/bs_mixins_overrides.scss
index f828ccded37..b2b54d554d8 100644
--- a/addons/web/static/src/scss/bs_mixins_overrides.scss
+++ b/addons/web/static/src/scss/bs_mixins_overrides.scss
@@ -22,7 +22,7 @@ $enable-deprecation-messages: false !default;
 
         @if ($with-muted) {
             .text-muted {
-                color: rgba($-yiq-color, 0.4) !important;
+                color: scale-color($-yiq-color, $alpha: -30%) !important;
             }
         }