diff --git a/test/test_tree.py b/test/test_tree.py
index be45d91f3ebd424a01577f74a62caa0985323f74..69fead4a9f65f7d1d57cd167a356bb77742dfd27 100644
--- a/test/test_tree.py
+++ b/test/test_tree.py
@@ -97,6 +97,7 @@ def run_build_test(builder, queue, dims, dtype, nparticles, do_plot,
     if (dtype == np.float32
             and dims == 2
             and queue.device.platform.name == "Portable Computing Language"):
+        # arg list lenghts disagree
         pytest.xfail("2D float doesn't work on POCL")
 
     logger.info(75*"-")
@@ -199,7 +200,7 @@ def particle_tree_test_decorator(f):
 
 
 @particle_tree_test_decorator
-def test_single_boxparticle_tree(ctx_getter, dtype, dims, do_plot=False):
+def test_single_box_particle_tree(ctx_getter, dtype, dims, do_plot=False):
     ctx = ctx_getter()
     queue = cl.CommandQueue(ctx)