diff --git a/Triangulation_3/include/CGAL/Triangulation_hierarchy_3.h b/Triangulation_3/include/CGAL/Triangulation_hierarchy_3.h
index 0831c09c656..1b58f90cad9 100644
--- a/Triangulation_3/include/CGAL/Triangulation_hierarchy_3.h
+++ b/Triangulation_3/include/CGAL/Triangulation_hierarchy_3.h
@@ -863,7 +863,7 @@ int
 Triangulation_hierarchy_3<Tr>::
 random_level()
 {
-  boost::geometric_distribution<> proba(1.0/ratio);
+  boost::geometric_distribution<> proba(1.0/double(ratio));
   boost::variate_generator<boost::rand48&, boost::geometric_distribution<> > die(random, proba);
 
   return (std::min)(die(), (int)maxlevel)-1;