diff --git a/llvm/include/llvm/CodeGen/MachineOperand.h b/llvm/include/llvm/CodeGen/MachineOperand.h
index 72f8775a26af..0bb6d7d3b5e5 100644
--- a/llvm/include/llvm/CodeGen/MachineOperand.h
+++ b/llvm/include/llvm/CodeGen/MachineOperand.h
@@ -379,7 +379,7 @@ public:
   /// the setReg method should be used.
   void ChangeToRegister(unsigned Reg, bool isDef, bool isImp = false,
                         bool isKill = false, bool isDead = false,
-                        bool isUndef = false);
+                        bool isUndef = false, bool isDebug = false);
   
   //===--------------------------------------------------------------------===//
   // Construction methods.
diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 12d30065b8a0..34f7781866ba 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -127,7 +127,8 @@ void MachineOperand::ChangeToImmediate(int64_t ImmVal) {
 /// the specified value.  If an operand is known to be an register already,
 /// the setReg method should be used.
 void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
-                                      bool isKill, bool isDead, bool isUndef) {
+                                      bool isKill, bool isDead, bool isUndef,
+                                      bool isDebug) {
   // If this operand is already a register operand, use setReg to update the 
   // register's use/def lists.
   if (isReg()) {
@@ -152,6 +153,7 @@ void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
   IsDead = isDead;
   IsUndef = isUndef;
   IsEarlyClobber = false;
+  IsDebug = isDebug;
   SubReg = 0;
 }