diff --git a/artiq/windows/default.nix b/artiq/windows/default.nix
index 8b21a85..1424656 100644
--- a/artiq/windows/default.nix
+++ b/artiq/windows/default.nix
@@ -23,6 +23,6 @@ stdenv.mkDerivation {
   installPhase = "touch $out";
   doCheck = true;
   checkPhase = ''
-    ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&set ARTIQ_LOW_LATENCY=1&&python -m unittest discover -v artiq.test"; }}/bin/run.sh
+    ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&python -m unittest discover -v artiq.test"; }}/bin/run.sh
   '';
 }
diff --git a/main.nix b/main.nix
index ea6a6e1..4e73da1 100644
--- a/main.nix
+++ b/main.nix
@@ -102,7 +102,7 @@ in
       export ARTIQ_LOW_LATENCY=1
       python -m unittest discover -v artiq.test.coredevice
 
-      ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&set ARTIQ_LOW_LATENCY=1&&python -m unittest discover -v artiq.test.coredevice"; }}/bin/run.sh
+      ${windowsRunner { testCommand = "set ARTIQ_ROOT=%cd%\\anaconda\\envs\\artiq-env\\Lib\\site-packages\\artiq\\examples\\kc705_nist_clock&&python -m unittest discover -v artiq.test.coredevice"; }}/bin/run.sh
 
       mkdir $out
       cp ${generatedNix}/pkgs/artiq-version.nix $out/passed3