diff --git a/guest-test/qemu_get_config.py b/guest-test/qemu_get_config.py
index 17adcf0..d9e906d 100755
--- a/guest-test/qemu_get_config.py
+++ b/guest-test/qemu_get_config.py
@@ -53,37 +53,37 @@
 # test_params.py is generated by test_launcher.sh for both qemu_runner.py and test_executor.sh
 # O-list variables default value from qemu.config.json
 vm_type = qemu_config["common"]["vm_type"]
-if PMU is not None:
+if 'PMU' in dir():
     pmu = PMU
 else:
     pmu = qemu_config["common"]["pmu"]
 
-if VCPU is not None:
+if 'VCPU' in dir():
     cpus = VCPU
 else:
     cpus = qemu_config["common"]["cpus"]
 
-if SOCKETS is not None:
+if 'SOCKETS' in dir():
     sockets = SOCKETS
 else:
     sockets = qemu_config["common"]["sockets"]
 
-if MEM is not None:
+if 'MEM' in dir():
     mem = MEM
 else:
     mem = qemu_config["common"]["mem"]
 
-if CMDLINE is not None:
+if 'CMDLINE' in dir():
     cmdline = CMDLINE
 else:
     cmdline = qemu_config["common"]["cmdline"]
 
-if DEBUG is not None:
+if 'DEBUG' in dir():
     debug = DEBUG
 else:
     debug = qemu_config["common"]["debug"]
 
-if TESTCASE is not None:
+if 'TESTCASE' in dir():
     testcase = TESTCASE
 else:
     print("No TESTCASE info found, can't run any test!")