diff --git a/lib/clang/libllvm/Makefile b/lib/clang/libllvm/Makefile
index cb9ab974abc..bd0aee918ef 100644
--- a/lib/clang/libllvm/Makefile
+++ b/lib/clang/libllvm/Makefile
@@ -155,6 +155,7 @@ SRCS_MIN+=	BinaryFormat/MachO.cpp
 SRCS_MIN+=	BinaryFormat/MsgPackDocument.cpp
 SRCS_MIN+=	BinaryFormat/MsgPackDocumentYAML.cpp
 SRCS_MIN+=	BinaryFormat/MsgPackReader.cpp
+SRCS_MIN+=	BinaryFormat/MsgPackWriter.cpp
 SRCS_MIN+=	BinaryFormat/Wasm.cpp
 SRCS_MIN+=	BinaryFormat/XCOFF.cpp
 SRCS_MIN+=	Bitcode/Reader/BitReader.cpp