diff --git a/SciFiReaders/readers/SID/Nsid_reader.py b/SciFiReaders/readers/SID/Nsid_reader.py
index 00968cf..b258a94 100644
--- a/SciFiReaders/readers/SID/Nsid_reader.py
+++ b/SciFiReaders/readers/SID/Nsid_reader.py
@@ -155,6 +155,7 @@ def read_all(self, recursive=True, parent=None):
 
         if recursive:
             list_of_main = self._main_dsets
+            keys = ['Channel_{0:3}'.format(i) for i in range(len(list_of_main))]
         else:
             list_of_main = []
             keys = []