diff --git a/lib/Debugger/Debugger.cpp b/lib/Debugger/Debugger.cpp
index e8194d9..78f48f6 100644
--- a/lib/Debugger/Debugger.cpp
+++ b/lib/Debugger/Debugger.cpp
@@ -47,7 +47,7 @@
 static Module *
 getMaterializedModuleProvider(const std::string &Filename) {
   std::auto_ptr<MemoryBuffer> Buffer;
-  Buffer.reset(MemoryBuffer::getFileOrSTDIN(&Filename[0], Filename.size()));
+  Buffer.reset(MemoryBuffer::getFileOrSTDIN(Filename.c_str()));
   if (Buffer.get())
     return ParseBitcodeFile(Buffer.get());
   return 0;