diff --git a/webservice/update_config.py b/webservice/update_config.py
index dd4206eabecd714322858f5411e6adf70b4a658c..295067378fb610a1d100d8641638b3ec61693ba5 100755
--- a/webservice/update_config.py
+++ b/webservice/update_config.py
@@ -89,7 +89,7 @@ JUNGFRAU_CONFIGURATIONS = {
         'roi-definitions': {'type': list, 'element_type': int},
     },
     'dark': {
-        'skip-ntrains': {'type': int},
+        'skip-first-ntrains': {'type': int},
     }
 }