diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index a3485bc..c5145ff 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -39,6 +39,7 @@
       Op.IsKill = false;
       Op.IsDead = false;
       Op.contents.RegNo = *ImpDefs;
+      Op.auxInfo.subReg = 0;
       Operands.push_back(Op);
     }
   if (TID->ImplicitUses)
@@ -50,6 +51,7 @@
       Op.IsKill = false;
       Op.IsDead = false;
       Op.contents.RegNo = *ImpUses;
+      Op.auxInfo.subReg = 0;
       Operands.push_back(Op);
     }
 }