diff --git a/llvm/utils/gn/secondary/llvm/lib/Target/X86/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/Target/X86/BUILD.gn
index e2351f36ed1b..7c27f7ca2158 100644
--- a/llvm/utils/gn/secondary/llvm/lib/Target/X86/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/Target/X86/BUILD.gn
@@ -77,6 +77,7 @@ static_library("LLVMX86CodeGen") {
     deps += [ ":X86GenFoldTables" ]
   }
   sources = [
+    "X86ArgumentStackSlotRebase.cpp",
     "X86AsmPrinter.cpp",
     "X86AvoidStoreForwardingBlocks.cpp",
     "X86AvoidTrailingCall.cpp",