diff --git a/particula/next/particles/tests/activity_builders_test.py b/particula/next/particles/tests/activity_builders_test.py
index 822500284..9bb5223f0 100644
--- a/particula/next/particles/tests/activity_builders_test.py
+++ b/particula/next/particles/tests/activity_builders_test.py
@@ -6,7 +6,6 @@
 
 import pytest
 import numpy as np
-import pytest
 from particula.next.particles.activity_builders import (
     IdealActivityMolarBuilder, IdealActivityMassBuilder,
     KappaParameterActivityBuilder