diff --git a/lib/elements/custom-style.html b/lib/elements/custom-style.html
index a4c65ec7c2..8a39463598 100644
--- a/lib/elements/custom-style.html
+++ b/lib/elements/custom-style.html
@@ -77,7 +77,7 @@
      *
      * @return {HTMLStyleElement} This element's light-DOM `<style>`
      */
-    getStyle() {
+    'getStyle'() {
       if (this._style) {
         return this._style;
       }