diff --git a/tests/alpha-blending-test.c b/tests/alpha-blending-test.c
index 4f10d544..cf2087a6 100644
--- a/tests/alpha-blending-test.c
+++ b/tests/alpha-blending-test.c
@@ -256,5 +256,6 @@ TEST(alpha_blend_monotonic)
 	wl_subsurface_destroy(sub);
 	wl_surface_destroy(surf);
 	buffer_destroy(buf);
+	wl_subcompositor_destroy(subco);
 	client_destroy(client);
 }