diff --git a/addons/web/static/src/scss/fields.scss b/addons/web/static/src/scss/fields.scss
index d1ab2d09c67..3de64e866ac 100644
--- a/addons/web/static/src/scss/fields.scss
+++ b/addons/web/static/src/scss/fields.scss
@@ -359,7 +359,7 @@
         }
 
         &.o_field_invalid > img {
-            border: 1px solid @brand-danger;
+            border: 1px solid $brand-danger;
         }
     }