1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Target/PTX/PTXMachineFunctionInfo.h b/lib/Target/PTX/PTXMachineFunctionInfo.h
index f40d8ca501..3b985f7dd6 100644
--- a/lib/Target/PTX/PTXMachineFunctionInfo.h
+++ b/lib/Target/PTX/PTXMachineFunctionInfo.h
@@ -128,9 +128,9 @@ public:
 
   /// getRegisterName - Returns the name of the specified virtual register. This
   /// name is used during PTX emission.
-  std::string getRegisterName(unsigned Reg) const {
+  const char *getRegisterName(unsigned Reg) const {
     if (RegNames.count(Reg))
-      return RegNames.lookup(Reg);
+      return RegNames.find(Reg)->second.c_str();
     else if (Reg == PTX::NoRegister)
       return "%noreg";
     else