diff --git a/lib/CodeGen/MachineLoopInfo.cpp b/lib/CodeGen/MachineLoopInfo.cpp
index d561a5b..269538b 100644
--- a/lib/CodeGen/MachineLoopInfo.cpp
+++ b/lib/CodeGen/MachineLoopInfo.cpp
@@ -17,6 +17,7 @@
 #include "llvm/CodeGen/MachineLoopInfo.h"
 #include "llvm/CodeGen/MachineDominators.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/Debug.h"
 using namespace llvm;
 
 namespace llvm {
@@ -73,3 +74,7 @@
   }
   return BotMBB;
 }
+
+void MachineLoop::dump() const {
+  print(dbgs());
+}