diff --git a/hysop/tools/io_utils.py b/hysop/tools/io_utils.py
index 2b991531e9758f42c6700dee68398538307cce7c..f8feae56809eaff10fe7b568394a30bca5f60b8f 100755
--- a/hysop/tools/io_utils.py
+++ b/hysop/tools/io_utils.py
@@ -266,7 +266,7 @@ class IOParams(namedtuple("IOParams", ['filename', 'filepath',
         if (frequency >= 0) and simulation.is_time_of_interest:
             dump |= (t in self.dump_times)
         if (frequency > 0):
-            dump |= ((simulaton.current_iteration % frequency) == 0)
+            dump |= ((simulation.current_iteration % frequency) == 0)
         return dump
 
     def clone(self, **kwds):