diff --git a/simulator/write_tune.sh b/simulator/write_tune.sh
index 119de7fc33..19a3c7be66 100755
--- a/simulator/write_tune.sh
+++ b/simulator/write_tune.sh
@@ -1 +1,4 @@
+#!/bin/bash
+
+set -e
 java -cp ../java_tools/tune-tools/build/libs/tune-tools.jar com.rusefi.tools.tune.WriteSimulatorConfiguration
\ No newline at end of file