diff --git a/tests/test_point_source.py b/tests/test_point_source.py
index 368272d..53fc42e 100644
--- a/tests/test_point_source.py
+++ b/tests/test_point_source.py
@@ -17,7 +17,7 @@ def test_creation():
         assert isinstance(source.angle, openmc.stats.Isotropic)
         assert isinstance(source.energy, openmc.stats.univariate.Normal) or isinstance(
             source.energy, openmc.stats.univariate.Tabular
-        )
+        ) or isinstance(source.energy, openmc.stats.Mixture)
 
 
 @pytest.mark.parametrize(
diff --git a/tests/test_ring_source.py b/tests/test_ring_source.py
index e7a0008..25e757a 100644
--- a/tests/test_ring_source.py
+++ b/tests/test_ring_source.py
@@ -17,7 +17,7 @@ def test_creation():
         assert isinstance(source.angle, openmc.stats.Isotropic)
         assert isinstance(source.energy, openmc.stats.univariate.Normal) or isinstance(
             source.energy, openmc.stats.univariate.Tabular
-        )
+        ) or isinstance(source.energy, openmc.stats.Mixture)
 
 
 @pytest.mark.parametrize("radius", [1, 5.6, 1e5, 7.0])