diff --git a/test/test_matrixgen.py b/test/test_matrixgen.py
index a6bc52d5aefbfca85ac6e6aeaa2d21683b192c6c..ed90ee1e5e930408b91da0e7bb8b657d1bfc4f18 100644
--- a/test/test_matrixgen.py
+++ b/test/test_matrixgen.py
@@ -213,7 +213,7 @@ def test_p2p_direct(ctx_factory, exclude_self, factor, lpot_id):
         extra_kwargs = {}
         if exclude_self:
             extra_kwargs["target_to_source"] = \
-                cl.array.arange(queue, 0, n, dtype=np.int)
+                cl.array.arange(queue, 0, n, dtype=np.int32)
         if lpot_id == 2:
             from pytools.obj_array import make_obj_array
             extra_kwargs["dsource_vec"] = \