diff --git a/pyomo/core/expr/visitor.py b/pyomo/core/expr/visitor.py
index 3c1e486d38f..3d5608bda4c 100644
--- a/pyomo/core/expr/visitor.py
+++ b/pyomo/core/expr/visitor.py
@@ -1389,11 +1389,7 @@ def visit(self, node):
 
 
 class _StreamVariableVisitor(StreamBasedExpressionVisitor):
-    def __init__(
-        self,
-        include_fixed=False,
-        descend_into_named_expressions=True,
-    ):
+    def __init__(self, include_fixed=False, descend_into_named_expressions=True):
         self._include_fixed = include_fixed
         self._descend_into_named_expressions = descend_into_named_expressions
         self.named_expressions = []