diff --git a/lib/Target/ARM/ARMConstantPoolValue.cpp b/lib/Target/ARM/ARMConstantPoolValue.cpp
index aadfd4779db..9576283553b 100644
--- a/lib/Target/ARM/ARMConstantPoolValue.cpp
+++ b/lib/Target/ARM/ARMConstantPoolValue.cpp
@@ -315,5 +315,6 @@ void ARMConstantPoolMBB::addSelectionDAGCSEId(FoldingSetNodeID &ID) {
 }
 
 void ARMConstantPoolMBB::print(raw_ostream &O) const {
+  O << "BB#" << MBB->getNumber();
   ARMConstantPoolValue::print(O);
 }