diff --git a/lib/elements/custom-style.js b/lib/elements/custom-style.js
index 447e03e439..f675393118 100644
--- a/lib/elements/custom-style.js
+++ b/lib/elements/custom-style.js
@@ -75,7 +75,7 @@ export class CustomStyle extends HTMLElement {
    * @export
    * @return {HTMLStyleElement} This element's light-DOM `<style>`
    */
-  ['getStyle']() {
+  getStyle() {
     if (this._style) {
       return this._style;
     }