diff --git a/pkgs/tools/backup/grab-site/default.nix b/pkgs/tools/backup/grab-site/default.nix
index 81e16ad005b..e69823ab45d 100644
--- a/pkgs/tools/backup/grab-site/default.nix
+++ b/pkgs/tools/backup/grab-site/default.nix
@@ -1,6 +1,14 @@
-{ stdenv, python3Packages, fetchFromGitHub }:
+{ stdenv, python37, fetchFromGitHub }:
 
-python3Packages.buildPythonApplication rec {
+let
+  python = python37.override {
+    self = python;
+    packageOverrides = self: super: {
+      tornado = super.tornado_4;
+    };
+  };
+
+in with python.pkgs; buildPythonApplication rec {
   version = "2.1.19";
   name = "grab-site-${version}";
 
@@ -11,7 +19,7 @@ python3Packages.buildPythonApplication rec {
     sha256 = "1v1hnhv5knzdl0kj3574ccwlh171vcb7faddp095ycdmiiybalk4";
   };
 
-  propagatedBuildInputs = with python3Packages; [
+  propagatedBuildInputs = [
     click ludios_wpull manhole lmdb autobahn fb-re2 websockets cchardet
   ];
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f290d376407..cc3d9f8fa6f 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -12529,9 +12529,7 @@ in
 
   gperftools = callPackage ../development/libraries/gperftools { };
 
-  grab-site = callPackage ../tools/backup/grab-site {
-    python3Packages = python37Packages;
-  };
+  grab-site = callPackage ../tools/backup/grab-site { };
 
   grib-api = callPackage ../development/libraries/grib-api { };