diff --git a/artiq-fast/shell-dev.nix b/artiq-fast/shell-dev.nix
index 88deddd..df8f5ef 100644
--- a/artiq-fast/shell-dev.nix
+++ b/artiq-fast/shell-dev.nix
@@ -3,7 +3,6 @@ with import <nixpkgs> {};
 
 
 let
-  set-scratch-dir = ./set-scratch-dir.sh;
   artiqpkgs = import ./default.nix { inherit pkgs; };
   vivado = import ./vivado.nix { inherit pkgs; };
   sipyco = python3Packages.buildPythonPackage rec {
@@ -74,14 +73,13 @@ in
       artiqpkgs.openocd
     ];
     shellHook = ''
-      source ${set-scratch-dir};
-      export PYTHONPATH="$scratch_dir/artiq_tools:$PYTHONPATH"
-      export PYTHONPATH="$scratch_dir/oitg:$PYTHONPATH"
-      export PYTHONPATH="$scratch_dir/analysis-library:$PYTHONPATH"
-      export PYTHONPATH="$scratch_dir/python-library:$PYTHONPATH"
-      export PYTHONPATH="$scratch_dir/strontium-library:$PYTHONPATH"
-      export PYTHONPATH="$scratch_dir/ndscan:$PYTHONPATH"
-      export PYTHONPATH="$scratch_dir/sipyco:$PYTHONPATH"
+      export PYTHONPATH="/home/thomp/scratch/artiq_tools:$PYTHONPATH"
+      export PYTHONPATH="/home/thomp/scratch/oitg:$PYTHONPATH"
+      export PYTHONPATH="/home/thomp/scratch/analysis-library:$PYTHONPATH"
+      export PYTHONPATH="/home/thomp/scratch/python-library:$PYTHONPATH"
+      export PYTHONPATH="/home/thomp/scratch/strontium-library:$PYTHONPATH"
+      export PYTHONPATH="/home/thomp/scratch/ndscan:$PYTHONPATH"
+      export PYTHONPATH="/home/thomp/scratch/sipyco:$PYTHONPATH"
     '';
     TARGET_AR="or1k-linux-ar";
   }