diff --git a/lib/MC/MCDisassembler/EDInst.h b/lib/MC/MCDisassembler/EDInst.h
index 0a98fea2c11..ceb9505028d 100644
--- a/lib/MC/MCDisassembler/EDInst.h
+++ b/lib/MC/MCDisassembler/EDInst.h
@@ -16,6 +16,7 @@
 #ifndef LLVM_EDINST_H
 #define LLVM_EDINST_H
 
+#include "llvm/Support/DataTypes.h"
 #include "llvm/ADT/SmallVector.h"
 #include <string>
 #include <vector>