diff --git a/hitl/run.sh b/hitl/run.sh
index c4a6c15..6602bf2 100755
--- a/hitl/run.sh
+++ b/hitl/run.sh
@@ -7,6 +7,9 @@
 #   This shell file is executed by the hardware runner in Quartiq's office to exercise the various
 #   hardware aspects of Stabilizer.
 
+# Enable shell operating mode flags.
+set -eux
+
 # Set up python for testing
 python3 -m venv --system-site-packages py
 source py/bin/activate