diff --git a/support/tools/TableGen/CodeGenWrappers.h b/support/tools/TableGen/CodeGenWrappers.h
index 595542a24ad..00ca3fcc603 100644
--- a/support/tools/TableGen/CodeGenWrappers.h
+++ b/support/tools/TableGen/CodeGenWrappers.h
@@ -12,6 +12,7 @@
 
 #include "llvm/CodeGen/ValueTypes.h"
 #include <iosfwd>
+#include <string>
 #include <vector>
 class Record;
 class RecordKeeper;
diff --git a/utils/TableGen/CodeGenTarget.h b/utils/TableGen/CodeGenTarget.h
index 595542a24ad..00ca3fcc603 100644
--- a/utils/TableGen/CodeGenTarget.h
+++ b/utils/TableGen/CodeGenTarget.h
@@ -12,6 +12,7 @@
 
 #include "llvm/CodeGen/ValueTypes.h"
 #include <iosfwd>
+#include <string>
 #include <vector>
 class Record;
 class RecordKeeper;
diff --git a/utils/TableGen/CodeGenWrappers.h b/utils/TableGen/CodeGenWrappers.h
index 595542a24ad..00ca3fcc603 100644
--- a/utils/TableGen/CodeGenWrappers.h
+++ b/utils/TableGen/CodeGenWrappers.h
@@ -12,6 +12,7 @@
 
 #include "llvm/CodeGen/ValueTypes.h"
 #include <iosfwd>
+#include <string>
 #include <vector>
 class Record;
 class RecordKeeper;