diff --git a/scripts/pylib/twister/twisterlib/harness.py b/scripts/pylib/twister/twisterlib/harness.py
index 3e8511e9d618d..aa55af865eb1c 100644
--- a/scripts/pylib/twister/twisterlib/harness.py
+++ b/scripts/pylib/twister/twisterlib/harness.py
@@ -243,6 +243,7 @@ def run_robot_test(self, command, handler):
                     f"Robot test failure: {handler.sourcedir} for {self.instance.platform.name}"
                 )
                 self.instance.status = TwisterStatus.FAIL
+                self.instance.reason = f"Exited with {renode_test_proc.returncode}"
                 self.instance.testcases[0].status = TwisterStatus.FAIL
 
             if out: