diff --git a/clang/unittests/Frontend/CodeGenActionTest.cpp b/clang/unittests/Frontend/CodeGenActionTest.cpp
index 3ff6c4e..71446fd 100644
--- a/clang/unittests/Frontend/CodeGenActionTest.cpp
+++ b/clang/unittests/Frontend/CodeGenActionTest.cpp
@@ -26,7 +26,7 @@
 class NullCodeGenAction : public CodeGenAction {
 public:
   NullCodeGenAction(llvm::LLVMContext *_VMContext = nullptr)
-    : CodeGenAction(Backend_EmitLL, _VMContext) {}
+    : CodeGenAction(Backend_EmitMCNull, _VMContext) {}
 
   // The action does not call methods of ATContext.
   void ExecuteAction() override {