diff -r 9f4b88e120e7 -r 9c5e5c931da5 src/arch/x86/tlb.cc
--- a/src/arch/x86/tlb.cc	Sun May 27 14:43:59 2012 -0700
+++ b/src/arch/x86/tlb.cc	Sun May 27 14:44:32 2012 -0700
@@ -284,7 +284,7 @@
                     return new GeneralProtection(0);
             }
         }
-        if (m5Reg.mode != LongMode ||
+        if (m5Reg.submode != SixtyFourBitMode ||
                 (flags & (AddrSizeFlagBit << FlagShift)))
             vaddr &= mask(32);
         // If paging is enabled, do the translation.