diff --git a/lib/Analysis/Interval.cpp b/lib/Analysis/Interval.cpp
index 05cfa75..69935db 100644
--- a/lib/Analysis/Interval.cpp
+++ b/lib/Analysis/Interval.cpp
@@ -46,7 +46,7 @@
 // getSourceGraphNode.
 //
 inline static BasicBlock *getNodeHeader(BasicBlock *BB) { return BB; }
-inline static BasicBlock *getNodeHeader(Interval *I) { return I->HeaderNode; }
+inline static BasicBlock *getNodeHeader(Interval *I) { return I->getHeaderNode(); }
 
 
 // getSourceGraphNode - Given a BasicBlock and the source graph, return the