diff --git a/pkgs/development/tools/parsing/tree-sitter/default.nix b/pkgs/development/tools/parsing/tree-sitter/default.nix
index c3bdca43f36a..a481b11d95fe 100644
--- a/pkgs/development/tools/parsing/tree-sitter/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/default.nix
@@ -28,7 +28,7 @@ let
   # to update:
   # 1) change all these hashes
   # 2) nix-build -A tree-sitter.updater.update-all-grammars
-  # 3) Set NIXPKGS_GITHUB_TOKEN env variable to avoid api rate limit (Use a Personal Access Token from https://github.com/settings/tokens It does not need any permissions)
+  # 3) Set GITHUB_TOKEN env variable to avoid api rate limit (Use a Personal Access Token from https://github.com/settings/tokens It does not need any permissions)
   # 4) run the ./result script that is output by that (it updates ./grammars)
   version = "0.25.3";
   hash = "sha256-xafeni6Z6QgPiKzvhCT2SyfPn0agLHo47y+6ExQXkzE=";
@@ -43,7 +43,7 @@ let
 
   update-all-grammars = callPackage ./update.nix { };
 
-  fetchGrammar = (
+  fetchGrammar =
     v:
     fetchgit {
       inherit (v)
@@ -52,8 +52,7 @@ let
         sha256
         fetchSubmodules
         ;
-    }
-  );
+    };
 
   grammars = runCommand "grammars" { } (
     ''
@@ -61,7 +60,7 @@ let
     ''
     + (lib.concatStrings (
       lib.mapAttrsToList (
-        name: grammar: "ln -s ${if grammar ? src then grammar.src else fetchGrammar grammar} $out/${name}\n"
+        name: grammar: "ln -s ${grammar.src or (fetchGrammar grammar)} $out/${name}\n"
       ) (import ./grammars { inherit lib; })
     ))
   );
@@ -134,7 +133,7 @@ let
           };
         };
     in
-    lib.mapAttrs build (grammars);
+    lib.mapAttrs build grammars;
 
   # Usage:
   # pkgs.tree-sitter.withPlugins (p: [ p.tree-sitter-c p.tree-sitter-java ... ])
diff --git a/pkgs/development/tools/parsing/tree-sitter/update.nix b/pkgs/development/tools/parsing/tree-sitter/update.nix
index bd6d3e51b210..c4e35962db3b 100644
--- a/pkgs/development/tools/parsing/tree-sitter/update.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/update.nix
@@ -578,15 +578,13 @@ let
      }
      ${updateImpl} print-all-grammars-nix-file "$(< ${
        jsonFile "all-grammars.json" {
-         allGrammars = (
-           lib.mapAttrsToList (
-             nixRepoAttrName: attrs:
-             attrs
-             // {
-               inherit nixRepoAttrName;
-             }
-           ) allGrammars
-         );
+         allGrammars = lib.mapAttrsToList (
+           nixRepoAttrName: attrs:
+           attrs
+           // {
+             inherit nixRepoAttrName;
+           }
+         ) allGrammars;
          inherit outputDir;
        }
      })"