diff --git a/artiq/artiq-board.nix b/artiq/artiq-board.nix
index c126b03..90f31db 100644
--- a/artiq/artiq-board.nix
+++ b/artiq/artiq-board.nix
@@ -47,7 +47,6 @@ let
 in pkgs.python3Packages.buildPythonPackage rec {
   name = "artiq-board-${target}-${variant}-${version}";
   version = import ./pkgs/artiq-version.nix;
-  src = null;
   phases = [ "buildPhase" "installPhase" ];
   buildPhase = 
     ''
diff --git a/artiq/windows/manual-test-run.nix b/artiq/windows/manual-test-run.nix
index 1424656..609c1e5 100644
--- a/artiq/windows/manual-test-run.nix
+++ b/artiq/windows/manual-test-run.nix
@@ -17,7 +17,6 @@ in
 
 stdenv.mkDerivation {
   name = "windows-test";
-  src = null;
 
   phases = [ "installPhase" "checkPhase" ];
   installPhase = "touch $out";
diff --git a/main.nix b/main.nix
index 4e73da1..1c08acf 100644
--- a/main.nix
+++ b/main.nix
@@ -55,7 +55,6 @@ in
 
     windows-no-hardware-tests = pkgs.stdenv.mkDerivation {
       name = "windows-no-hardware-tests";
-      src = null;
       buildInputs = [ (windowsRunner {}) ];
       phases = [ "buildPhase" ];
       buildPhase = ''