diff --git a/pelicun/tools/DL_calculation.py b/pelicun/tools/DL_calculation.py
index fbf1950ae..4161e4e3e 100644
--- a/pelicun/tools/DL_calculation.py
+++ b/pelicun/tools/DL_calculation.py
@@ -62,6 +62,45 @@
 
 from jsonschema import validate
 
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 import pelicun
 from pelicun.auto import auto_populate
 from pelicun.base import str2bool