diff --git a/src/serial/gitter_hexa_top.h b/src/serial/gitter_hexa_top.h
index 075b7423f50ff016ee56dc472f32acb29151ac74..6ff953d6a9f83f40c0139c262aab0c8452aa972d 100644
--- a/src/serial/gitter_hexa_top.h
+++ b/src/serial/gitter_hexa_top.h
@@ -103,6 +103,7 @@ template < class A > class Hface4Top : public A {
     innerface_t * next () ;
     const innerface_t * next () const ;
     void append (innerface_t * f) ;
+
   public :
     virtual myrule_t getrule () const ;
     virtual bool refine (myrule_t,int) ;
diff --git a/src/serial/gitter_sti.h b/src/serial/gitter_sti.h
index d7e542de62aae3a3178d2752d9487e0df11cfcfe..959d015cff93bac4575d716cd137e66769a7c86e 100644
--- a/src/serial/gitter_sti.h
+++ b/src/serial/gitter_sti.h
@@ -734,6 +734,8 @@ public :
       inline void backup  (ostream & os ) const;
       inline void restore (istream & is ) ;
 
+      int nChild () const { return 0 ; }
+
       // Extramethode zum Rausschreiben der Elementdaten in einfachem
       // Format f"ur die Visualisierung mit GRAPE: