diff --git a/support/testing/tests/package/test_lsof.py b/support/testing/tests/package/test_lsof.py
index b0478dfbb7..336a951549 100644
--- a/support/testing/tests/package/test_lsof.py
+++ b/support/testing/tests/package/test_lsof.py
@@ -28,8 +28,7 @@ class TestLsof(infra.basetest.BRTest):
         self.assertRunOk("lsof")
 
         # Check lsof fails if requested file is not opened
-        _, exit_code = self.emulator.run("lsof {}".format(test_file))
-        self.assertNotEqual(exit_code, 0)
+        self.assertRunNotOk("lsof {}".format(test_file))
 
         # Open the test file from the shell on descriptor 10
         self.assertRunOk("exec 10> {}".format(test_file))