diff --git a/databases/sfcgal/files/patch-include_CGAL_boost_graph_iterator.h b/databases/sfcgal/files/patch-include_CGAL_boost_graph_iterator.h
index b02e6b3a1723..396d074dd967 100644
--- a/databases/sfcgal/files/patch-include_CGAL_boost_graph_iterator.h
+++ b/databases/sfcgal/files/patch-include_CGAL_boost_graph_iterator.h
@@ -1,38 +1,38 @@
---- ../CGAL-5.6.1/include/CGAL/boost/graph/iterator.h	2024-02-24 21:04:12 UTC
-+++ ../CGAL-5.6.1/include/CGAL/boost/graph/iterator.h
+--- ../CGAL-5.6/include/CGAL/boost/graph/iterator.h	2024-02-24 21:04:12 UTC
++++ ../CGAL-5.6/include/CGAL/boost/graph/iterator.h
 @@ -214,11 +214,6 @@ class Halfedge_around_source_iterator { (public)
  
  #ifndef DOXYGEN_RUNNING
  
 -  explicit operator bool() const
 -  {
 -    return (! (this->base() == nullptr));
 -  }
 -
    bool operator==( const Self& i) const {
      CGAL_assertion( anchor == anchor);
      return  ( g == i.g) && ( pos == i.pos) && ( winding == i.winding);
 @@ -308,11 +303,6 @@ class Halfedge_around_target_iterator { (public)
  
  #ifndef DOXYGEN_RUNNING
  
 -  explicit operator bool() const
 -  {
 -    return (! (this->base() == nullptr));
 -  }
 -
    bool operator==( const Self& i) const {
      CGAL_assertion( anchor == anchor);
      return  ( g == i.g) && ( pos == i.pos) && ( winding == i.winding);
 @@ -399,11 +389,6 @@ class Halfedge_around_face_iterator { (public)
    const value_type& operator *  ( ) const { return  pos; }
    pointer           operator -> ( )       { return &pos; }
    const value_type* operator -> ( ) const { return &pos; }
 -
 -  explicit operator bool() const
 -  {
 -    return (! (this->base() == nullptr));
 -  }
  
    bool operator==( const Self& i) const {
      CGAL_assertion( anchor == anchor);