diff --git a/pymbolic/interop/maxima.py b/pymbolic/interop/maxima.py
index 2995767a0826d737fb4b3c0469b0ecde67b781e7..4be1dcf92e00769c6aa33b446e91e9488c346c91 100644
--- a/pymbolic/interop/maxima.py
+++ b/pymbolic/interop/maxima.py
@@ -45,6 +45,7 @@ import numpy as np
 from pymbolic.mapper.stringifier import StringifyMapper
 from pymbolic.parser import Parser as ParserBase, FinalizedTuple
 
+
 IN_PROMPT_RE = re.compile(br"\(%i([0-9]+)\) ")
 OUT_PROMPT_RE = re.compile(br"\(%o([0-9]+)\) ")
 ERROR_PROMPT_RE = re.compile(