diff --git a/src/hyperv/hyperv_wmi_generator.py b/src/hyperv/hyperv_wmi_generator.py
index 6e98f0a89c..0dcd9e4383 100755
--- a/src/hyperv/hyperv_wmi_generator.py
+++ b/src/hyperv/hyperv_wmi_generator.py
@@ -44,9 +44,9 @@ class WmiClass:
     to.
     """
 
-    def __init__(self, name, versions = []):
+    def __init__(self, name, versions=None):
         self.name = name
-        self.versions = versions
+        self.versions = versions if versions else list()
         self.common = None