diff --git a/libsrc/meshing/meshfunc.cpp b/libsrc/meshing/meshfunc.cpp
index c39c855d..a9a05f20 100644
--- a/libsrc/meshing/meshfunc.cpp
+++ b/libsrc/meshing/meshfunc.cpp
@@ -531,6 +531,7 @@ namespace netgen
          return;
      }
 
+     mesh.VolumeElements().DeleteAll();
      for(auto & m_ : md)
      {
          auto first_new_pi = m_.pmap.Range().Next();