diff --git a/llvm/utils/gn/secondary/lldb/source/Plugins/Platform/MacOSX/BUILD.gn b/llvm/utils/gn/secondary/lldb/source/Plugins/Platform/MacOSX/BUILD.gn
index f4a3a0dbeae600..553ec5eef22749 100644
--- a/llvm/utils/gn/secondary/lldb/source/Plugins/Platform/MacOSX/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/source/Plugins/Platform/MacOSX/BUILD.gn
@@ -34,6 +34,7 @@ static_library("MacOSX") {
   include_dirs = [ "//lldb/source" ]
   sources = [
     "PlatformDarwin.cpp",
+    "PlatformDarwinDevice.cpp",
     "PlatformDarwinKernel.cpp",
     "PlatformMacOSX.cpp",
     "PlatformRemoteAppleBridge.cpp",