diff --git a/openmc/__init__.py b/openmc/__init__.py
index a0492ee408..2aeacd689b 100644
--- a/openmc/__init__.py
+++ b/openmc/__init__.py
@@ -22,6 +22,7 @@ from openmc.executor import *
 from openmc.statepoint import *
 from openmc.summary import *
 from openmc.particle_restart import *
+from openmc.mixin import *
 
 try:
     from openmc.opencg_compatible import *
diff --git a/openmc/data/kalbach_mann.py b/openmc/data/kalbach_mann.py
index c44c46b654..5aca17ba9f 100644
--- a/openmc/data/kalbach_mann.py
+++ b/openmc/data/kalbach_mann.py
@@ -5,7 +5,6 @@ from warnings import warn
 import numpy as np
 
 import openmc.checkvalue as cv
-from openmc.mixin import Equality
 from openmc.stats import Tabular, Univariate, Discrete, Mixture
 from .function import Tabulated1D, INTERPOLATION_SCHEME
 from .angle_energy import AngleEnergy
diff --git a/openmc/data/library.py b/openmc/data/library.py
index 3fed7598d3..6c2600f320 100644
--- a/openmc/data/library.py
+++ b/openmc/data/library.py
@@ -3,8 +3,10 @@ import xml.etree.ElementTree as ET
 
 import h5py
 
+from openmc.mixin import Equality
 from openmc.clean_xml import clean_xml_indentation
 
+
 class DataLibrary(Equality):
     def __init__(self):
         self.libraries = []
diff --git a/openmc/data/uncorrelated.py b/openmc/data/uncorrelated.py
index 399db3e7cc..0361c9b37a 100644
--- a/openmc/data/uncorrelated.py
+++ b/openmc/data/uncorrelated.py
@@ -1,7 +1,6 @@
 import numpy as np
 
 import openmc.checkvalue as cv
-from openmc.mixin import Equality
 from .angle_energy import AngleEnergy
 from .energy_distribution import EnergyDistribution
 from .angle_distribution import AngleDistribution