diff --git a/pkgs/servers/sql/postgresql/ext/pg_topn.nix b/pkgs/servers/sql/postgresql/ext/pg_topn.nix
index 3271c6ac7a68..a6ac3c5ea70e 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_topn.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_topn.nix
@@ -1,9 +1,9 @@
 {
-  lib,
-  stdenv,
-  fetchFromGitHub,
-  postgresql,
   buildPostgresqlExtension,
+  fetchFromGitHub,
+  lib,
+  postgresql,
+  stdenv,
 }:
 
 buildPostgresqlExtension rec {
@@ -13,16 +13,16 @@ buildPostgresqlExtension rec {
   src = fetchFromGitHub {
     owner = "citusdata";
     repo = "postgresql-topn";
-    rev = "refs/tags/v${version}";
-    sha256 = "sha256-lP6Iil/BUv4ga+co+oBpKv1FBqFuBGfNjueEolM6png=";
+    tag = "v${version}";
+    hash = "sha256-lP6Iil/BUv4ga+co+oBpKv1FBqFuBGfNjueEolM6png=";
   };
 
-  meta = with lib; {
+  meta = {
     description = "Efficient querying of 'top values' for PostgreSQL";
     homepage = "https://github.com/citusdata/postgresql-topn";
     changelog = "https://github.com/citusdata/postgresql-topn/raw/v${version}/CHANGELOG.md";
-    maintainers = with maintainers; [ thoughtpolice ];
+    maintainers = with lib.maintainers; [ thoughtpolice ];
     platforms = postgresql.meta.platforms;
-    license = licenses.agpl3Only;
+    license = lib.licenses.agpl3Only;
   };
 }