diff --git a/packages/@vuepress/theme-default/src/client/styles/normalize.scss b/packages/@vuepress/theme-default/src/client/styles/normalize.scss
index 76dacd2e37..0a4435357c 100644
--- a/packages/@vuepress/theme-default/src/client/styles/normalize.scss
+++ b/packages/@vuepress/theme-default/src/client/styles/normalize.scss
@@ -129,6 +129,7 @@ a.header-anchor {
   padding-right: 0.23em;
   margin-top: 0.125em;
   opacity: 0;
+  user-select: none;
 
   &:hover {
     text-decoration: none;