diff --git a/libsrc/core/mpi_wrapper.hpp b/libsrc/core/mpi_wrapper.hpp
index f6e70dab..c7dfc53a 100644
--- a/libsrc/core/mpi_wrapper.hpp
+++ b/libsrc/core/mpi_wrapper.hpp
@@ -537,7 +537,7 @@ namespace ngcore
   class NgMPI_Requests
   {
   public:
-    NgMPI_Requests & operator+= (NgMPI_Request &&) { return *rhis; }
+    NgMPI_Requests & operator+= (NgMPI_Request &&) { return *this; }
     NgMPI_Requests & operator+= (NG_MPI_Request r) { return *this; }
     void WaitAll() { ; }
     int WaitAny() { return 0; }