Index: unittests/Frontend/CodeGenActionTest.cpp
===================================================================
--- unittests/Frontend/CodeGenActionTest.cpp
+++ 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 {