diff --git a/llvm/utils/gn/secondary/llvm/unittests/ADT/BUILD.gn b/llvm/utils/gn/secondary/llvm/unittests/ADT/BUILD.gn
index ca712be1e3946..0695d5d691352 100644
--- a/llvm/utils/gn/secondary/llvm/unittests/ADT/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/unittests/ADT/BUILD.gn
@@ -80,6 +80,7 @@ unittest("ADTTests") {
     "TinyPtrVectorTest.cpp",
     "TripleTest.cpp",
     "TwineTest.cpp",
+    "TypeSwitchTest.cpp",
     "TypeTraitsTest.cpp",
     "WaymarkingTest.cpp",
   ]