diff --git a/tests/lassi/test_c2h4n4.py b/tests/lassi/test_c2h4n4.py
index ede606ca..0254a953 100644
--- a/tests/lassi/test_c2h4n4.py
+++ b/tests/lassi/test_c2h4n4.py
@@ -195,7 +195,7 @@ def test_lassis_slow (self):
             las2.lasci ()
             lsis2 = LASSIS (las2).run ()
             self.assertTrue (lsis2.converged)
-            self.assertAlmostEqual (lib.fp (lsis_scanner.e_roots), lib.fp (lsis2.e_roots), 7)
+            self.assertAlmostEqual (lsis_scanner.e_roots[0], lsis2.e_roots[0], 7)
 
 
     def test_contract_hlas_ci (self):