diff --git a/lib/modules/Array.pmod b/lib/modules/Array.pmod
index 9efb4a2877c9afb43eec3ab9055619db6324fa8e..595653f4b3d9e9045895950d32772a768121a96a 100644
--- a/lib/modules/Array.pmod
+++ b/lib/modules/Array.pmod
@@ -3,6 +3,7 @@
 constant diff = __builtin.diff;
 constant diff_longest_sequence = __builtin.diff_longest_sequence;
 constant diff_compare_table = __builtin.diff_compare_table;
+constant longest_ordered_sequence = __builtin.longest_ordered_sequence;
 
 constant sort = __builtin.sort;