diff --git a/pkgs/tools/misc/past-time/default.nix b/pkgs/tools/misc/past-time/default.nix
index 3079b69ad34..4e551a041bd 100644
--- a/pkgs/tools/misc/past-time/default.nix
+++ b/pkgs/tools/misc/past-time/default.nix
@@ -1,13 +1,9 @@
 { lib
-, buildPythonApplication
-, click
 , fetchFromGitHub
-, freezegun
-, pytestCheckHook
-, tqdm
+, python3
 }:
 
-buildPythonApplication rec {
+python3.pkgs.buildPythonApplication rec {
   pname = "past-time";
   version = "0.2.1";
   format = "setuptools";
@@ -16,15 +12,15 @@ buildPythonApplication rec {
     owner = "fabaff";
     repo = pname;
     rev = "refs/tags/${version}";
-    sha256 = "0yhc0630rmcx4ia9y6klpx002mavfmqf1s3jb2gz54jlccwqbfgl";
+    hash = "sha256-9LmFOWNUkvKfWHLo4HB1W1UBQL90Gp9UJJ3VDIYBDHo=";
   };
 
-  propagatedBuildInputs = [
+  propagatedBuildInputs = with python3.pkgs; [
     click
     tqdm
   ];
 
-  nativeCheckInputs = [
+  nativeCheckInputs = with python3.pkgs; [
     freezegun
     pytestCheckHook
   ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index be33c1d3d06..040b025741b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11437,7 +11437,7 @@ with pkgs;
 
   cnping = callPackage ../tools/networking/cnping { };
 
-  past-time = python3Packages.callPackage ../tools/misc/past-time { };
+  past-time = callPackage ../tools/misc/past-time { };
 
   pastebinit = callPackage ../tools/misc/pastebinit { };