diff --git a/llvm/utils/gn/secondary/llvm/lib/Target/PowerPC/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/Target/PowerPC/BUILD.gn
index 9adb514705d4..209b342a0a24 100644
--- a/llvm/utils/gn/secondary/llvm/lib/Target/PowerPC/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/Target/PowerPC/BUILD.gn
@@ -65,6 +65,7 @@ static_library("LLVMPowerPCCodeGen") {
     "PPCCTRLoops.cpp",
     "PPCCallingConv.cpp",
     "PPCEarlyReturn.cpp",
+    "PPCExpandAtomicPseudoInsts.cpp",
     "PPCExpandISEL.cpp",
     "PPCFastISel.cpp",
     "PPCFrameLowering.cpp",