diff --git a/llvm/utils/gn/secondary/llvm/lib/Support/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/Support/BUILD.gn
index fab37e8ecc1e..476353e958d7 100644
--- a/llvm/utils/gn/secondary/llvm/lib/Support/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/Support/BUILD.gn
@@ -43,6 +43,7 @@ static_library("Support") {
     "ARMTargetParser.cpp",
     "ARMWinEH.cpp",
     "Allocator.cpp",
+    "AutoConvert.cpp",
     "BinaryStreamError.cpp",
     "BinaryStreamReader.cpp",
     "BinaryStreamRef.cpp",