diff --git a/tools/python/xen/xm/create.py b/tools/python/xen/xm/create.py
index 5dfa698f9d..fe2a2e4f04 100644
--- a/tools/python/xen/xm/create.py
+++ b/tools/python/xen/xm/create.py
@@ -264,6 +264,7 @@ def randomMAC():
 
     @return: MAC address string
     """
+    random.seed()
     mac = [ 0xaa, 0x00, 0x00,
             random.randint(0x00, 0x7f),
             random.randint(0x00, 0xff),