diff --git a/packages/@vuepress/theme-default/styles/index.styl b/packages/@vuepress/theme-default/styles/index.styl
index 1b34f6022a..a09b0abe89 100644
--- a/packages/@vuepress/theme-default/styles/index.styl
+++ b/packages/@vuepress/theme-default/styles/index.styl
@@ -146,6 +146,7 @@ a.header-anchor
   margin-left -0.87em
   padding-right 0.23em
   margin-top 0.125em
+  user-select none
   opacity 0
 
   &:focus,