diff --git a/config/config.default.yaml b/config/config.default.yaml
index 90a086ab..255a5c1b 100644
--- a/config/config.default.yaml
+++ b/config/config.default.yaml
@@ -278,7 +278,7 @@ lines:
   max_extension: 20000 #MW
   length_factor: 1.25
   reconnect_crimea: true
-  under_construction: 'zero' # 'zero': set capacity to zero, 'remove': remove, 'keep': with full capacity
+  under_construction: 'keep' # 'zero': set capacity to zero, 'remove': remove, 'keep': with full capacity
   dynamic_line_rating:
     activate: false
     cutout: europe-2013-era5