diff --git a/flake.nix b/flake.nix
index a4910c1..a04d20e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -40,6 +40,9 @@
               pkgs.nodejs
               pkgs.python38Packages.poetry
             ];
+            shellHook = ''
+              unset PYTHONPATH
+            '';
           };
 
           packages.strojnadzor = pkgs.poetry2nix.mkPoetryApplication {