diff --git a/llvm/utils/gn/secondary/clang-tools-extra/clangd/tool/BUILD.gn b/llvm/utils/gn/secondary/clang-tools-extra/clangd/tool/BUILD.gn
--- a/llvm/utils/gn/secondary/clang-tools-extra/clangd/tool/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang-tools-extra/clangd/tool/BUILD.gn
@@ -11,6 +11,7 @@
     "//clang/lib/Basic",
     "//clang/lib/Format",
     "//clang/lib/Frontend",
+    "//clang/lib/Headers",
     "//clang/lib/Sema",
     "//clang/lib/Tooling",
     "//clang/lib/Tooling/Core",