diff --git a/tests/pipeline/test_technical.py b/tests/pipeline/test_technical.py
index 9a019459..cd5ada22 100644
--- a/tests/pipeline/test_technical.py
+++ b/tests/pipeline/test_technical.py
@@ -435,7 +435,7 @@ class MovingAverageConvergenceDivergenceTestCase(ZiplineTestCase):
         )
         assert_equal(
             ewma.window_length,
-            slow_period+signal_period-1,
+            slow_period + signal_period - 1,
         )
 
     @parameter_space(