diff --git a/Alpha_shapes_3/test/Alpha_shapes_3/include/CGAL/_count_alpha.h b/Alpha_shapes_3/test/Alpha_shapes_3/include/CGAL/_count_alpha.h
index 082e9df0563..dbcc58ea781 100644
--- a/Alpha_shapes_3/test/Alpha_shapes_3/include/CGAL/_count_alpha.h
+++ b/Alpha_shapes_3/test/Alpha_shapes_3/include/CGAL/_count_alpha.h
@@ -204,8 +204,9 @@ count_faces(const AS &A, bool verbose)
 
 }
 
+// forward declaration
 template <class AS>
-void show_alpha_status(AS&); // forward declaration
+void show_alpha_status(AS&, const typename AS::Alpha_status&);
 
 template <class AS>
 void