diff --git a/tests/test_graph.py b/tests/test_graph.py
index 80f8be54..53f87ad5 100644
--- a/tests/test_graph.py
+++ b/tests/test_graph.py
@@ -81,7 +81,7 @@ def test_graph_num_output_channels():
     output = AudioOut_Dummy(5)
     graph = AudioGraph(output_device=output, start=False)
     assert graph.num_output_channels == 5
-    del graph
+    graph.destroy()
 
 
 def test_graph_render_to_buffer(graph):