diff --git a/clang/include/clang/Lex/LiteralSupport.h b/clang/include/clang/Lex/LiteralSupport.h
index 3a2e8d276e42..a093e1a5ec91 100644
--- a/clang/include/clang/Lex/LiteralSupport.h
+++ b/clang/include/clang/Lex/LiteralSupport.h
@@ -19,6 +19,7 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/APFloat.h"
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/DataTypes.h"