diff --git a/doc/go1.19.html b/doc/go1.19.html
index 727873890b..50bc973c13 100644
--- a/doc/go1.19.html
+++ b/doc/go1.19.html
@@ -72,7 +72,7 @@ provides parsing and reformatting of doc comments
 as well as support for rendering them to HTML, Markdown, and text.
 </p>
 
-<h3 id="go-unix">New <code>unix</code> build constraint</h4>
+<h3 id="go-unix">New <code>unix</code> build constraint</h3>
 
 <p><!-- CL 389934 --><!-- https://go.dev/issue/20322 --><!-- https://go.dev/issue/51572 -->
   The build constraint <code>unix</code> is now recognized