diff --git a/src/postprocessor/core/lineageprocess.py b/src/postprocessor/core/lineageprocess.py
index 1c875020bbb9e1a92062ddc7d398b8b079b06437..f9031715bb605882e8a2983853441d0964515732 100644
--- a/src/postprocessor/core/lineageprocess.py
+++ b/src/postprocessor/core/lineageprocess.py
@@ -6,6 +6,7 @@ import numpy as np
 import pandas as pd
 
 from agora.abc import ParametersABC
+from agora.utils.kymograph import get_index_as_np
 from postprocessor.core.abc import PostProcessABC