diff --git a/include/llvm/CodeGen/MachineBasicBlock.h b/include/llvm/CodeGen/MachineBasicBlock.h
index b11adfe3c71..bb50b5df4ca 100644
--- a/include/llvm/CodeGen/MachineBasicBlock.h
+++ b/include/llvm/CodeGen/MachineBasicBlock.h
@@ -358,6 +358,8 @@ private:   // Methods used to maintain doubly linked list of blocks...
 
 raw_ostream& operator<<(raw_ostream &OS, const MachineBasicBlock &MBB);
 
+void WriteAsOperand(raw_ostream &, const MachineBasicBlock*, bool t);
+
 //===--------------------------------------------------------------------===//
 // GraphTraits specializations for machine basic block graphs (machine-CFGs)
 //===--------------------------------------------------------------------===//
diff --git a/include/llvm/CodeGen/MachineDominators.h b/include/llvm/CodeGen/MachineDominators.h
index e56776b1440..086528aaf57 100644
--- a/include/llvm/CodeGen/MachineDominators.h
+++ b/include/llvm/CodeGen/MachineDominators.h
@@ -23,8 +23,6 @@
 
 namespace llvm {
 
-inline void WriteAsOperand(raw_ostream &, const MachineBasicBlock*, bool t) {  }
-
 template<>
 inline void DominatorTreeBase<MachineBasicBlock>::addRoot(MachineBasicBlock* MBB) {
   this->Roots.push_back(MBB);
diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 7b14a4c8513..cd52825d21f 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -447,3 +447,8 @@ bool MachineBasicBlock::CorrectExtraCFGEdges(MachineBasicBlock *DestA,
   }
   return MadeChange;
 }
+
+void llvm::WriteAsOperand(raw_ostream &OS, const MachineBasicBlock *MBB,
+                          bool t) {
+  OS << "BB#" << MBB->getNumber();
+}