diff --git a/eo/tutorial/Templates/init.tmpl b/eo/tutorial/Templates/init.tmpl
index 96d45b3a..f3c0fbd9 100644
--- a/eo/tutorial/Templates/init.tmpl
+++ b/eo/tutorial/Templates/init.tmpl
@@ -45,6 +45,7 @@ public:
   {
     // START Code of random initialization of an eoMyStruct object
     // END   Code of random initialization of an eoMyStruct object
+    _genotype.invalidate();	   // IMPORTANT in case the _genotype is old
   }
 
 private: