diff --git a/libsrc/visualization/soldata.hpp b/libsrc/visualization/soldata.hpp
index 74143fc0..c522f1a3 100644
--- a/libsrc/visualization/soldata.hpp
+++ b/libsrc/visualization/soldata.hpp
@@ -141,6 +141,7 @@ namespace netgen
   class DLL_HEADER UserVisualizationObject
   {
   public:
+    virtual ~UserVisualizationObject() { ; } 
     virtual void Draw () = 0;
   };