diff --git a/pyadjoint/adjfloat.py b/pyadjoint/adjfloat.py
index 48ae57ba..57e633fa 100644
--- a/pyadjoint/adjfloat.py
+++ b/pyadjoint/adjfloat.py
@@ -128,6 +128,7 @@ def _ad_str(self):
         """Return the string of the taped value of this variable."""
         return str(self.block_variable.saved_output)
 
+
 _min = min
 _max = max