diff --git a/python/cdo/cdo.py b/python/cdo/cdo.py
index e0cd6fe..09a105f 100644
--- a/python/cdo/cdo.py
+++ b/python/cdo/cdo.py
@@ -313,7 +313,9 @@ def __getOperators(self):  # {{{
                 "utf-8")[0:-1].split(os.linesep)))
 
             for i, op in enumerate(ops):
-                operators[op] = int(ios[i][1:len(ios[i]) - 1].split('|')[1])
+                _ios_splitted = ios[i][1:len(ios[i]) - 1].split('|')
+                if len(_ios_splitted) > 1 : 
+                    operators[op] = int(_ios_splitted[1])
 
         return operators  # }}}