diff --git a/docs/_template/light-dark-theme/styles/styleswitcher.js b/docs/_template/light-dark-theme/styles/styleswitcher.js
index e80a17daf..a87b89525 100644
--- a/docs/_template/light-dark-theme/styles/styleswitcher.js
+++ b/docs/_template/light-dark-theme/styles/styleswitcher.js
@@ -1,5 +1,4 @@
 const baseUrl = document.getElementById("docfx-style:rel").content;
-var themeElement;
 
 function onThemeSelect(event) {
     const theme = event.target.value;