diff --git a/utils/gn/secondary/clang-tools-extra/clangd/support/BUILD.gn b/utils/gn/secondary/clang-tools-extra/clangd/support/BUILD.gn
index e855accbb24..06a063fcbf6 100644
--- a/utils/gn/secondary/clang-tools-extra/clangd/support/BUILD.gn
+++ b/utils/gn/secondary/clang-tools-extra/clangd/support/BUILD.gn
@@ -13,6 +13,7 @@ static_library("support") {
     "Context.cpp",
     "Logger.cpp",
     "Markup.cpp",
+    "MemoryTree.cpp",
     "Shutdown.cpp",
     "Threading.cpp",
     "ThreadsafeFS.cpp",
diff --git a/utils/gn/secondary/clang-tools-extra/clangd/unittests/BUILD.gn b/utils/gn/secondary/clang-tools-extra/clangd/unittests/BUILD.gn
index 409eaf8105a..8872b36e4a8 100644
--- a/utils/gn/secondary/clang-tools-extra/clangd/unittests/BUILD.gn
+++ b/utils/gn/secondary/clang-tools-extra/clangd/unittests/BUILD.gn
@@ -105,6 +105,7 @@ unittest("ClangdTests") {
     "support/ContextTests.cpp",
     "support/FunctionTests.cpp",
     "support/MarkupTests.cpp",
+    "support/MemoryTreeTests.cpp",
     "support/TestTracer.cpp",
     "support/ThreadingTests.cpp",
     "support/TraceTests.cpp",