diff --git a/llvm/tools/lto/lto.cpp b/llvm/tools/lto/lto.cpp
index e7062b59d521..ad5addee7bea 100644
--- a/llvm/tools/lto/lto.cpp
+++ b/llvm/tools/lto/lto.cpp
@@ -23,6 +23,7 @@
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/raw_ostream.h"
 
 // extra command-line flags needed for LTOCodeGenerator
 static cl::opt<char>