diff --git a/llvm/utils/gn/secondary/clang/unittests/Tooling/Syntax/BUILD.gn b/llvm/utils/gn/secondary/clang/unittests/Tooling/Syntax/BUILD.gn
index 72035a5717fd..f2e13288dbc0 100644
--- a/llvm/utils/gn/secondary/clang/unittests/Tooling/Syntax/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/unittests/Tooling/Syntax/BUILD.gn
@@ -16,7 +16,8 @@ unittest("SyntaxTests") {
     "//llvm/lib/Testing/Support",
   ]
   sources = [
+    "BuildTreeTest.cpp",
+    "MutationsTest.cpp",
     "TokensTest.cpp",
-    "TreeTest.cpp",
   ]
 }