diff --git a/addons/web_editor/static/src/scss/web_editor.variables.scss b/addons/web_editor/static/src/scss/web_editor.variables.scss
index 2d14a069b08..6c4336581a9 100644
--- a/addons/web_editor/static/src/scss/web_editor.variables.scss
+++ b/addons/web_editor/static/src/scss/web_editor.variables.scss
@@ -112,6 +112,9 @@ $o-we-switch-inactive-color: $o-we-color-paper !default;
         color: #555;
         background-color: #fff;
         border-radius: 0;
+        &.is-invalid {
+            border-color: $danger;
+        }
     }
 
     .was-validated {