diff --git a/lib/Bytecode/Reader/ConstantReader.cpp b/lib/Bytecode/Reader/ConstantReader.cpp
index 88bfa3444a2..df1336084e3 100644
--- a/lib/Bytecode/Reader/ConstantReader.cpp
+++ b/lib/Bytecode/Reader/ConstantReader.cpp
@@ -10,6 +10,7 @@
 
 #include "ReaderInternals.h"
 #include "llvm/Module.h"
+#include "llvm/Constants.h"
 #include <algorithm>
 
 using std::make_pair;