diff --git a/Number_types/include/CGAL/Interval_nt.h b/Number_types/include/CGAL/Interval_nt.h
index 83197616a40..4a67d0a7e27 100644
--- a/Number_types/include/CGAL/Interval_nt.h
+++ b/Number_types/include/CGAL/Interval_nt.h
@@ -40,7 +40,6 @@
 #include <CGAL/FPU.h>
 #include <CGAL/Uncertain.h>
 #include <CGAL/Interval_nt_fwd.h>
-#include <CGAL/number_utils_fwd.h>
 #include <CGAL/functional_base.h> // Unary_function, Binary_function
 
 #include <CGAL/Algebraic_structure_traits.h>
diff --git a/Number_types/include/CGAL/number_utils_classes.h b/Number_types/include/CGAL/number_utils_classes.h
index ae5660e68ee..cb64c20807f 100644
--- a/Number_types/include/CGAL/number_utils_classes.h
+++ b/Number_types/include/CGAL/number_utils_classes.h
@@ -32,7 +32,7 @@
 #include <algorithm>
 #include <utility>
 #include <CGAL/functional_base.h>
-#include <CGAL/number_utils_fwd.h>
+#include <CGAL/number_utils.h>
 
 CGAL_BEGIN_NAMESPACE