diff --git a/src/corelib/kernel/qmetatype.h b/src/corelib/kernel/qmetatype.h
index e40cd85b227..219feac91fe 100644
--- a/src/corelib/kernel/qmetatype.h
+++ b/src/corelib/kernel/qmetatype.h
@@ -2370,7 +2370,6 @@ public:
         /*.legacyRegisterOp=*/ nullptr
     };
 };
-#undef QT_METATYPE_CONSTEXPRLAMDA
 
 /*
  MSVC instantiates extern templates