diff --git a/src/pygambit/tests/test_behav.py b/src/pygambit/tests/test_behav.py
index f88c84b6a..5f5697a7b 100644
--- a/src/pygambit/tests/test_behav.py
+++ b/src/pygambit/tests/test_behav.py
@@ -2,6 +2,7 @@
 
 import pygambit as gbt
 
+
 class TestGambitMixedBehavGame(unittest.TestCase):
     def setUp(self):
         self.game = gbt.Game.read_game(