diff --git a/quicksort.pl b/quicksort.pl
index c18564e..1ed30fe 100644
--- a/quicksort.pl
+++ b/quicksort.pl
@@ -1,6 +1,7 @@
 % Implementacja Quicksorta w Prologu
 % Autor korpo, https://github.com/korpo
 
+project_dedalus_quicksort([],[]).
 project_dedalus_quicksort([X],[X]).
 project_dedalus_quicksort([X|Xs],Ys) :-
   project_dedalus_quicksort_helper_partition(Xs,X,Left,Right),
diff --git a/tests.pl b/tests.pl
index fbaf4d2..62c42ab 100644
--- a/tests.pl
+++ b/tests.pl
@@ -7,7 +7,7 @@
   sort(L, Sorted).
 
 test(quicksort,[nondet]) :-
-  L=[8,4,2,1,3,6,5,7,12,10,9,11,14,13,15],
+  randseq(15,15,L),
   project_dedalus_quicksort(L, Sorted),
   sort(L, Sorted).