diff --git a/misc/plover.nix b/misc/plover.nix
index e185507..8322bb1 100644
--- a/misc/plover.nix
+++ b/misc/plover.nix
@@ -70,7 +70,7 @@ in rec {
     src = inputs.regenpfeifer;
     nativeBuildInputs = [regenpfeifer-env];
     buildPhase = ''
-      pypy3 -m regenpfeifer.dictionary_generator ${wortformliste} $out unmatched.log 300000 300000
+      PYTHONPATH=${regenpfeifer-env}/site-packages LC_ALL=C.UTF-8 pypy3 -m regenpfeifer.dictionary_generator ${wortformliste} $out unmatched.log 300000 300000
     '';
     installPhase = "cat unmatched.log";
   };