diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index ce7f4c8ff24..dd455821689 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -39,6 +39,7 @@
 #include "llvm/Config/config.h"
 #include <algorithm>
 #include <iostream>
+#include <ios>
 #include <sstream>
 using namespace llvm;
 
diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index ce7f4c8ff24..dd455821689 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -39,6 +39,7 @@
 #include "llvm/Config/config.h"
 #include <algorithm>
 #include <iostream>
+#include <ios>
 #include <sstream>
 using namespace llvm;