diff --git a/STL_Extension/include/CGAL/Iterator_project.h b/STL_Extension/include/CGAL/Iterator_project.h
index 8f73fe7606d..bbafd8000f1 100644
--- a/STL_Extension/include/CGAL/Iterator_project.h
+++ b/STL_Extension/include/CGAL/Iterator_project.h
@@ -139,7 +139,7 @@ public:
   }
 
 template <typename It>
-#if defined(BOOST_MSVC) && (BOOST_MSVC <= 1920)
+#if defined(BOOST_MSVC)
   difference_type
 #else