diff --git a/lib/IR/DiagnosticPrinter.cpp b/lib/IR/DiagnosticPrinter.cpp
index 04cd6c7e6f7..d76f9f586a9 100644
--- a/lib/IR/DiagnosticPrinter.cpp
+++ b/lib/IR/DiagnosticPrinter.cpp
@@ -90,7 +90,7 @@ DiagnosticPrinter &DiagnosticPrinterRawOStream::operator<<(double N) {
 }
 
 DiagnosticPrinter &DiagnosticPrinterRawOStream::operator<<(const Twine &Str) {
-  Stream << Str.getSingleStringRef();
+  Str.print(Stream);
   return *this;
 }