diff --git a/llvm/utils/gn/secondary/llvm/lib/Target/RISCV/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/Target/RISCV/BUILD.gn
index 963d5bba50bae..1cf6f028e7483 100644
--- a/llvm/utils/gn/secondary/llvm/lib/Target/RISCV/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/Target/RISCV/BUILD.gn
@@ -64,6 +64,7 @@ static_library("LLVMRISCVCodeGen") {
   sources = [
     "RISCVAsmPrinter.cpp",
     "RISCVCallLowering.cpp",
+    "RISCVExpandAtomicPseudoInsts.cpp",
     "RISCVExpandPseudoInsts.cpp",
     "RISCVFrameLowering.cpp",
     "RISCVISelDAGToDAG.cpp",