diff --git a/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
index d4d9cc27a5d026..42a221989352fa 100644
--- a/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
@@ -191,6 +191,7 @@ static_library("CodeGen") {
     "ScheduleDAGInstrs.cpp",
     "ScheduleDAGPrinter.cpp",
     "ScoreboardHazardRecognizer.cpp",
+    "SelectOptimize.cpp",
     "ShadowStackGCLowering.cpp",
     "ShrinkWrap.cpp",
     "SjLjEHPrepare.cpp",