diff --git a/qemu/tests/physical_resources_check.py b/qemu/tests/physical_resources_check.py
index 5e4a848ee2c8df9dceae43d8fdd590e118d04ebd..228157ef157d68a31743b0f687bf20e7cb80da5a 100644
--- a/qemu/tests/physical_resources_check.py
+++ b/qemu/tests/physical_resources_check.py
@@ -136,6 +136,7 @@ def run_physical_resources_check(test, params, env):
     def verify_machine_type():
         f_fail = []
         cmd = params.get("check_machine_type_cmd")
+        fail_log = ""
 
         if cmd is None:
             return f_fail