diff --git a/doc/contributing/coding-conventions.chapter.md b/doc/contributing/coding-conventions.chapter.md
index 03cd3dd458c8..eb9932d48b68 100644
--- a/doc/contributing/coding-conventions.chapter.md
+++ b/doc/contributing/coding-conventions.chapter.md
@@ -456,7 +456,7 @@ In the file `pkgs/top-level/all-packages.nix` you can find fetch helpers, these
     owner = "NixOS";
     repo = "nix";
     rev = "1f795f9f44607cc5bec70d1300150bfefcef2aae";
-    hash = "ha256-7D4m+saJjbSFP5hOwpQq2FGR2rr+psQMTcyb1ZvtXsQ=";
+    hash = "sha256-7D4m+saJjbSFP5hOwpQq2FGR2rr+psQMTcyb1ZvtXsQ=";
   }
   ```