diff --git a/tests/avocado/acpi-bits.py b/tests/avocado/acpi-bits.py
index 898c837f26..14038fa3c4 100644
--- a/tests/avocado/acpi-bits.py
+++ b/tests/avocado/acpi-bits.py
@@ -50,7 +50,7 @@ from qemu.machine import QEMUMachine
 from avocado import skipIf
 from avocado_qemu import QemuBaseTest
 
-deps = ["xorriso"] # dependent tools needed in the test setup/box.
+deps = ["xorriso", "mformat"] # dependent tools needed in the test setup/box.
 supported_platforms = ['x86_64'] # supported test platforms.