diff --git a/pkgs/servers/sql/postgresql/ext/pgroonga.nix b/pkgs/servers/sql/postgresql/ext/pgroonga.nix
index 6ea65c6a5ccd..68a3da58a1fb 100644
--- a/pkgs/servers/sql/postgresql/ext/pgroonga.nix
+++ b/pkgs/servers/sql/postgresql/ext/pgroonga.nix
@@ -1,12 +1,12 @@
 {
-  lib,
-  stdenv,
+  buildPostgresqlExtension,
   fetchFromGitHub,
+  groonga,
+  lib,
+  msgpack-c,
   pkg-config,
   postgresql,
-  msgpack-c,
-  groonga,
-  buildPostgresqlExtension,
+  stdenv,
   xxHash,
 }:
 
@@ -17,7 +17,7 @@ buildPostgresqlExtension rec {
   src = fetchFromGitHub {
     owner = "pgroonga";
     repo = "pgroonga";
-    rev = "${version}";
+    tag = "${version}";
     hash = "sha256-a5nNtlUiFBuuqWAjIN0gU/FaoV3VpJh+/fab8R/77dw=";
   };
 
@@ -34,7 +34,7 @@ buildPostgresqlExtension rec {
     "MSGPACK_PACKAGE_NAME=msgpack-c"
   ];
 
-  meta = with lib; {
+  meta = {
     description = "PostgreSQL extension to use Groonga as the index";
     longDescription = ''
       PGroonga is a PostgreSQL extension to use Groonga as the index.
@@ -44,8 +44,8 @@ buildPostgresqlExtension rec {
     '';
     homepage = "https://pgroonga.github.io/";
     changelog = "https://github.com/pgroonga/pgroonga/releases/tag/${version}";
-    license = licenses.postgresql;
+    license = lib.licenses.postgresql;
     platforms = postgresql.meta.platforms;
-    maintainers = with maintainers; [ DerTim1 ];
+    maintainers = with lib.maintainers; [ DerTim1 ];
   };
 }