diff --git a/doc/manual/redirects.js b/doc/manual/redirects.js
index 5cd6fdea2..6813dc6d6 100644
--- a/doc/manual/redirects.js
+++ b/doc/manual/redirects.js
@@ -342,6 +342,10 @@ const redirects = {
   "installation/installing-binary.html": {
     "uninstalling": "uninstall.html"
   }
+  "contributing/hacking.html": {
+    "nix-with-flakes": "#building-nix-with-flakes"
+    "classic-nix": "#building-nix"
+  }
 };
 
 // the following code matches the current page's URL against the set of redirects.