diff --git a/pyomo/contrib/interior_point/interface.py b/pyomo/contrib/interior_point/interface.py
index e95327072d8..a249207bda8 100644
--- a/pyomo/contrib/interior_point/interface.py
+++ b/pyomo/contrib/interior_point/interface.py
@@ -11,6 +11,7 @@
 
 from abc import ABCMeta, abstractmethod
 from pyomo.contrib.pynumero.interfaces import pyomo_nlp, ampl_nlp
+
 try:
     from pyomo.contrib.pynumero.sparse import BlockVector, BlockMatrix
 except ImportError as e: