diff --git a/nix/tests.nix b/nix/tests.nix
index 670ba82a..e5e1d968 100644
--- a/nix/tests.nix
+++ b/nix/tests.nix
@@ -25,6 +25,9 @@ in {
       ${../util/test_runner.py} -t 30 fpga "$1" \
         --elf-file ${sonata-system-software}/bin/test_runner \
         --tcl-file ${../util/sonata-openocd-cfg.tcl}
+      echo "RTOS test suite"
+      ${../util/test_runner.py} -t 600 fpga "$1" \
+        --uf2-file ${cheriot-rtos-test-suite}/share/test-suite.uf2
     '';
   };