diff --git a/configs/ruby/Ruby.py b/configs/ruby/Ruby.py
index 622771a..86d5748 100644
--- a/configs/ruby/Ruby.py
+++ b/configs/ruby/Ruby.py
@@ -136,7 +136,7 @@
             mem_ctrl = m5.objects.MemCtrl(dram = dram_intf)
 
             if options.access_backing_store:
-                mem_ctrl.kvm_map=False
+                dram_intf.kvm_map=False
 
             mem_ctrls.append(mem_ctrl)
             dir_ranges.append(mem_ctrl.dram.range)