diff --git a/support/testing/tests/package/test_mtools.py b/support/testing/tests/package/test_mtools.py
index 23ec08b6d6..8fc8766207 100644
--- a/support/testing/tests/package/test_mtools.py
+++ b/support/testing/tests/package/test_mtools.py
@@ -29,8 +29,7 @@ class TestMtools(infra.basetest.BRTest):
         # Any Mtools command is expected to fail on an unformatted
         # partition.
         cmd = f"minfo {mtools_opts} ::"
-        _, exit_code = self.emulator.run(cmd)
-        self.assertNotEqual(exit_code, 0)
+        self.assertRunNotOk(cmd)
 
         # Now, let's format the partition file to FAT
         self.assertRunOk(f"mformat {mtools_opts} ::")