diff --git a/llvm/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp b/llvm/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
index aef8431..efa428c 100644
--- a/llvm/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
+++ b/llvm/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
@@ -3,6 +3,7 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Method.h"
+#include "Support/SetOperations.h"
 #include <iostream>
 using std::cerr;