diff --git a/include/llvm/Analysis/Interval.h b/include/llvm/Analysis/Interval.h
index 3974c728716..86965df90d9 100644
--- a/include/llvm/Analysis/Interval.h
+++ b/include/llvm/Analysis/Interval.h
@@ -13,6 +13,7 @@
 #ifndef LLVM_INTERVAL_H
 #define LLVM_INTERVAL_H
 
+#include "Support/GraphTraits.h"
 #include <vector>
 #include <iosfwd>
 
@@ -111,4 +112,31 @@ inline Interval::pred_iterator pred_end(Interval *I)   {
   return I->Predecessors.end();
 }
 
+template <> struct GraphTraits<Interval*> {
+  typedef Interval NodeType;
+  typedef Interval::succ_iterator ChildIteratorType;
+
+  static NodeType *getEntryNode(Interval *I) { return I; }
+
+  // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
+  static inline ChildIteratorType child_begin(NodeType *N) { 
+    return succ_begin(N);
+  }
+  static inline ChildIteratorType child_end(NodeType *N) { 
+    return succ_end(N);
+  }
+};
+
+template <> struct GraphTraits<Inverse<Interval*> > {
+  typedef Interval NodeType;
+  typedef Interval::pred_iterator ChildIteratorType;
+  static NodeType *getEntryNode(Inverse<Interval *> G) { return G.Graph; }
+  static inline ChildIteratorType child_begin(NodeType *N) { 
+    return pred_begin(N);
+  }
+  static inline ChildIteratorType child_end(NodeType *N) { 
+    return pred_end(N);
+  }
+};
+
 #endif