diff --git a/pyomo/contrib/mindtpy/algorithm_base_class.py b/pyomo/contrib/mindtpy/algorithm_base_class.py
index 533b4daa88f..d562c924a7d 100644
--- a/pyomo/contrib/mindtpy/algorithm_base_class.py
+++ b/pyomo/contrib/mindtpy/algorithm_base_class.py
@@ -86,6 +86,7 @@
 tabu_list, tabu_list_available = attempt_import('pyomo.contrib.mindtpy.tabu_list')
 egb = attempt_import('pyomo.contrib.pynumero.interfaces.external_grey_box')[0]
 
+
 class _MindtPyAlgorithm(object):
     def __init__(self, **kwds):
         """
diff --git a/pyomo/contrib/mindtpy/tests/MINLP_simple.py b/pyomo/contrib/mindtpy/tests/MINLP_simple.py
index 7498b65adad..04315f59458 100644
--- a/pyomo/contrib/mindtpy/tests/MINLP_simple.py
+++ b/pyomo/contrib/mindtpy/tests/MINLP_simple.py
@@ -40,6 +40,7 @@
 from pyomo.common.collections import ComponentMap
 from pyomo.contrib.mindtpy.tests.MINLP_simple_grey_box import GreyBoxModel
 from pyomo.common.dependencies import attempt_import
+
 egb = attempt_import('pyomo.contrib.pynumero.interfaces.external_grey_box')[0]
 
 
diff --git a/pyomo/contrib/mindtpy/tests/MINLP_simple_grey_box.py b/pyomo/contrib/mindtpy/tests/MINLP_simple_grey_box.py
index d6af495d504..9fccf1e7108 100644
--- a/pyomo/contrib/mindtpy/tests/MINLP_simple_grey_box.py
+++ b/pyomo/contrib/mindtpy/tests/MINLP_simple_grey_box.py
@@ -1,6 +1,7 @@
 from pyomo.common.dependencies import numpy as np
 import pyomo.common.dependencies.scipy.sparse as scipy_sparse
 from pyomo.common.dependencies import attempt_import
+
 egb = attempt_import('pyomo.contrib.pynumero.interfaces.external_grey_box')[0]