diff --git a/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn b/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn
index 256fba3ca38c00..f19f94899dd7ab 100644
--- a/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/source/Commands/BUILD.gn
@@ -66,6 +66,7 @@ static_library("Commands") {
     "CommandObjectWatchpoint.cpp",
     "CommandObjectWatchpointCommand.cpp",
     "CommandOptionArgumentTable.cpp",
+    "CommandOptionsProcessAttach.cpp",
     "CommandOptionsProcessLaunch.cpp",
   ]
 }