diff --git a/llvm/utils/gn/secondary/llvm/lib/Target/AArch64/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/Target/AArch64/BUILD.gn
index ca1295133ec7..78d75d540fc4 100644
--- a/llvm/utils/gn/secondary/llvm/lib/Target/AArch64/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/Target/AArch64/BUILD.gn
@@ -115,6 +115,7 @@ static_library("LLVMAArch64CodeGen") {
     "AArch64RedundantCopyElimination.cpp",
     "AArch64RegisterInfo.cpp",
     "AArch64SIMDInstrOpt.cpp",
+    "AArch64SLSHardening.cpp",
     "AArch64SelectionDAGInfo.cpp",
     "AArch64SpeculationHardening.cpp",
     "AArch64StackTagging.cpp",