diff --git a/Arrangement_on_surface_2/include/CGAL/Arr_algebraic_segment_traits_2.h b/Arrangement_on_surface_2/include/CGAL/Arr_algebraic_segment_traits_2.h
index 256d4bc4dde..ff9f847609c 100644
--- a/Arrangement_on_surface_2/include/CGAL/Arr_algebraic_segment_traits_2.h
+++ b/Arrangement_on_surface_2/include/CGAL/Arr_algebraic_segment_traits_2.h
@@ -1,5 +1,6 @@
 #include <CGAL/basic.h>
 
+#include <CGAL/Algebraic_kernel_1.h>
 #include <CGAL/Algebraic_kernel_d/Algebraic_curve_kernel_2.h>
 
 #include <CGAL/Curved_kernel_via_analysis_2.h>