diff --git a/libsrc/meshing/meshtype.hpp b/libsrc/meshing/meshtype.hpp
index e4cdda3f..d369fbbc 100644
--- a/libsrc/meshing/meshtype.hpp
+++ b/libsrc/meshing/meshtype.hpp
@@ -154,7 +154,7 @@ namespace netgen
     int i;
   public:
     class t_invalid { public: constexpr t_invalid() = default; };
-    static constexpr t_invalid INVALID;
+    static constexpr t_invalid INVALID{};
     
     PointIndex () = default;
     PointIndex (const PointIndex&) = default;