diff --git a/llvm/utils/gn/secondary/clang/unittests/Basic/BUILD.gn b/llvm/utils/gn/secondary/clang/unittests/Basic/BUILD.gn
index 499f9c42bb17..aea01ec93d48 100644
--- a/llvm/utils/gn/secondary/clang/unittests/Basic/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/unittests/Basic/BUILD.gn
@@ -9,6 +9,7 @@ unittest("BasicTests") {
   ]
   sources = [
     "CharInfoTest.cpp",
+    "DarwinSDKInfoTest.cpp",
     "DiagnosticTest.cpp",
     "FileEntryTest.cpp",
     "FileManagerTest.cpp",