diff --git a/src/python/m5/objects/PhysicalMemory.py b/src/python/m5/objects/PhysicalMemory.py
index f4818763f..bc427aa88 100644
--- a/src/python/m5/objects/PhysicalMemory.py
+++ b/src/python/m5/objects/PhysicalMemory.py
@@ -4,7 +4,7 @@ from MemObject import *
 class PhysicalMemory(MemObject):
     type = 'PhysicalMemory'
     port = Port("the access port")
-    range = Param.AddrRange("Device Address")
+    range = Param.AddrRange(AddrRange('128MB'), "Device Address")
     file = Param.String('', "memory mapped file")
     latency = Param.Latency(Parent.clock, "latency of an access")