diff --git a/lib/elements/custom-style.js b/lib/elements/custom-style.js
index f675393118..1a43b318e0 100644
--- a/lib/elements/custom-style.js
+++ b/lib/elements/custom-style.js
@@ -87,6 +87,7 @@ export class CustomStyle extends HTMLElement {
     const include = style.getAttribute(attr);
     if (include) {
       style.removeAttribute(attr);
+      /** @suppress {deprecated} */
       style.textContent = cssFromModules(include) + style.textContent;
     }
     /*