diff --git a/llvm/utils/gn/secondary/lldb/source/Plugins/Process/gdb-remote/BUILD.gn b/llvm/utils/gn/secondary/lldb/source/Plugins/Process/gdb-remote/BUILD.gn
index eff3e6a1e18a54..03d45bc41a1c91 100644
--- a/llvm/utils/gn/secondary/lldb/source/Plugins/Process/gdb-remote/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/source/Plugins/Process/gdb-remote/BUILD.gn
@@ -41,6 +41,7 @@ static_library("gdb-remote") {
     "GDBRemoteCommunicationServerLLGS.cpp",
     "GDBRemoteCommunicationServerPlatform.cpp",
     "GDBRemoteRegisterContext.cpp",
+    "GDBRemoteRegisterFallback.cpp",
     "ProcessGDBRemote.cpp",
     "ProcessGDBRemoteLog.cpp",
     "ThreadGDBRemote.cpp",