diff --git a/llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn b/llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn
index cb98198dc879..e21727d22e34 100644
--- a/llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn
@@ -106,6 +106,7 @@ static_library("clangd") {
     "XRefs.cpp",
     "index/Background.cpp",
     "index/BackgroundIndexStorage.cpp",
+    "index/BackgroundQueue.cpp",
     "index/BackgroundRebuild.cpp",
     "index/CanonicalIncludes.cpp",
     "index/FileIndex.cpp",