diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h
index 119adaa..3bea2de 100644
--- a/include/llvm/CodeGen/SelectionDAGNodes.h
+++ b/include/llvm/CodeGen/SelectionDAGNodes.h
@@ -1745,10 +1745,10 @@
 
 class SDNodeIterator : public std::iterator<std::forward_iterator_tag,
                                             SDNode, ptrdiff_t> {
-  SDNode *Node;
+  const SDNode *Node;
   unsigned Operand;
 
-  SDNodeIterator(SDNode *N, unsigned Op) : Node(N), Operand(Op) {}
+  SDNodeIterator(const SDNode *N, unsigned Op) : Node(N), Operand(Op) {}
 public:
   bool operator==(const SDNodeIterator& x) const {
     return Operand == x.Operand;
@@ -1779,8 +1779,8 @@
     return Operand - Other.Operand;
   }
 
-  static SDNodeIterator begin(SDNode *N) { return SDNodeIterator(N, 0); }
-  static SDNodeIterator end  (SDNode *N) {
+  static SDNodeIterator begin(const SDNode *N) { return SDNodeIterator(N, 0); }
+  static SDNodeIterator end  (const SDNode *N) {
     return SDNodeIterator(N, N->getNumOperands());
   }
 
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
index 618da52..3921635 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
@@ -49,7 +49,7 @@
 
     template<typename EdgeIter>
     static std::string getEdgeSourceLabel(const void *Node, EdgeIter I) {
-      return itostr(I - SDNodeIterator::begin((SDNode *) Node));
+      return itostr(I - SDNodeIterator::begin((const SDNode *) Node));
     }
 
     /// edgeTargetsEdgeSource - This method returns true if this outgoing edge