diff --git a/artiq-zynq.nix b/artiq-zynq.nix
index 3e97923..6b7854f 100644
--- a/artiq-zynq.nix
+++ b/artiq-zynq.nix
@@ -72,7 +72,9 @@ in
           artiq_run --device-db ${<artiq-zynq>}/examples/device_db.py ${<artiq-zynq>}/examples/mandelbrot.py
 
           echo Running ARTIQ unit tests...
-          ARTIQ_ROOT=${<artiq-zynq>}/examples python -m unittest discover artiq.test.coredevice -v
+          export ARTIQ_ROOT=${<artiq-zynq>}/examples
+          export ARTIQ_LOW_LATENCY=1
+          python -m unittest discover artiq.test.coredevice -v
 
           touch $out