diff --git a/llvm/lib/IR/GCStrategy.cpp b/llvm/lib/IR/GCStrategy.cpp
--- a/llvm/lib/IR/GCStrategy.cpp
+++ b/llvm/lib/IR/GCStrategy.cpp
@@ -32,7 +32,7 @@
     const std::string error =
         std::string("unsupported GC: ") + Name.str() +
         " (did you remember to link and initialize the library?)";
-    report_fatal_error(error);
+    report_fatal_error(Twine(error));
   } else
-    report_fatal_error(std::string("unsupported GC: ") + Name.str());
+    report_fatal_error(Twine(std::string("unsupported GC: ") + Name.str()));
 }