diff --git a/pkgs/by-name/pe/petsc/package.nix b/pkgs/by-name/pe/petsc/package.nix
index 0d0ae9cf3cc3..c00d34d61006 100644
--- a/pkgs/by-name/pe/petsc/package.nix
+++ b/pkgs/by-name/pe/petsc/package.nix
@@ -177,7 +177,7 @@ stdenv.mkDerivation rec {
   nativeInstallCheckInputs = [ mpiCheckPhaseHook ];
 
   passthru = {
-    inherit mpiSupport;
+    inherit mpiSupport pythonSupport;
   };
 
   setupHook = ./setup-hook.sh;