diff --git a/flake.nix b/flake.nix
index bee5ee4..660ebea 100644
--- a/flake.nix
+++ b/flake.nix
@@ -174,6 +174,9 @@
             pglive
             qtextras
           ]);
+          shellHook = ''
+            export PYTHONPATH=`pwd`/pytec:$PYTHONPATH
+          '';
       };
       defaultPackage.x86_64-linux = thermostat;
     };