diff --git a/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn b/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn
index a42f781271a21..b6c2f465a7292 100644
--- a/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn
@@ -21,6 +21,7 @@ static_library("lib") {
   sources = [
     "Breakpoint.cpp",
     "BreakpointBase.cpp",
+    "ClientLauncher.cpp",
     "CommandPlugins.cpp",
     "DAP.cpp",
     "DAPError.cpp",