diff --git a/pkgs/by-name/pf/pflotran/package.nix b/pkgs/by-name/pf/pflotran/package.nix
index b67c0955c1b0..037df5e99e81 100644
--- a/pkgs/by-name/pf/pflotran/package.nix
+++ b/pkgs/by-name/pf/pflotran/package.nix
@@ -11,7 +11,7 @@
   parmetis,
   hdf5-fortran-mpi,
   mpiCheckPhaseHook,
-  python3,
+  python312Packages,
 }:
 
 let
@@ -31,6 +31,7 @@ let
       {
         withMetis = true;
         withParmetis = true;
+        python3Packages = python312Packages;
       };
 in
 stdenv.mkDerivation (finalAttrs: {