diff --git a/packages/docusaurus-theme-classic/src/index.ts b/packages/docusaurus-theme-classic/src/index.ts
index ac2ea69a4c..f219d9039b 100644
--- a/packages/docusaurus-theme-classic/src/index.ts
+++ b/packages/docusaurus-theme-classic/src/index.ts
@@ -125,7 +125,6 @@ export default function themeClassic(
           {
             tagName: 'svg',
             attributes: {
-              xmlns: 'http://www.w3.org/2000/svg',
               style: 'display: none;',
             },
             innerHTML: SvgSpriteDefs,