diff --git a/spec/pycall/pyobject_wrapper_spec.rb b/spec/pycall/pyobject_wrapper_spec.rb
index 5b37c70..e67570b 100644
--- a/spec/pycall/pyobject_wrapper_spec.rb
+++ b/spec/pycall/pyobject_wrapper_spec.rb
@@ -161,7 +161,7 @@ module PyCall
           list = PyCall::List.new([*1..10])
           expect(list[(1..-1).step(2)]).to eq(PyCall::List.new([2, 4, 6, 8, 10]))
           expect(list[(1..-2).step(2)]).to eq(PyCall::List.new([2, 4, 6, 8]))
-          expect(list[(nil..nil).step(-1)]).to eq(PyCall::List.new([*1..10].reverse))
+          expect(list[(10..1).step(-1)]).to eq(PyCall::List.new([*1..10].reverse))
           expect(list[(-1..0).step(-1)]).to eq(PyCall::List.new([*1..10].reverse))
           expect(list[(-1...0).step(-1)]).to eq(PyCall::List.new([*2..10].reverse))
           expect(list[(-2..2).step(-2)]).to eq(PyCall::List.new([9, 7, 5, 3]))