diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 0ec5c33..08fef5f 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -332,7 +332,7 @@
   }
 }
 
-void MachineBasicBlock::printAsOperand(raw_ostream &OS, bool /*PrintType*/) {
+void MachineBasicBlock::printAsOperand(raw_ostream &OS, bool /*PrintType*/) const {
   OS << "BB#" << getNumber();
 }