diff --git a/lattice2ValueSeriesGenerator.py b/lattice2ValueSeriesGenerator.py
index b772a34..a207a49 100644
--- a/lattice2ValueSeriesGenerator.py
+++ b/lattice2ValueSeriesGenerator.py
@@ -229,7 +229,7 @@ class ValueSeriesGenerator:
                     new_list = []
                     for v in list_evenDistrib:
                         new_list.append(v)
-                        if v > 1e-12:
+                        if abs(v) > 1e-12:
                             new_list.append(-v)
                     list_evenDistrib = new_list