diff --git a/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
index 90d759dc58f76d..d8f067aa74f326 100644
--- a/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
@@ -91,6 +91,7 @@ static_library("CodeGen") {
     "LowerEmuTLS.cpp",
     "MBFIWrapper.cpp",
     "MIRCanonicalizerPass.cpp",
+    "MIRFSDiscriminator.cpp",
     "MIRNamerPass.cpp",
     "MIRPrinter.cpp",
     "MIRPrintingPass.cpp",