diff --git a/pynemo/utils/cmems_errors.py b/pynemo/utils/cmems_errors.py
index 3b40971fad6f98c8c4886e4b74462ca8cb10896f..89a2cca43e810ad51099a93efb52a4cb5b21c430 100644
--- a/pynemo/utils/cmems_errors.py
+++ b/pynemo/utils/cmems_errors.py
@@ -11,7 +11,7 @@ MOTU_retry = {'004-27': 'Error in NetcdfWriter finish',
               'Excp 11': 'Execution failed: [Excp 11] "Dataset retrival incomplete.'
               }
 # errors that are not worth retrying e.g. cmems network is down
-MOTU_critical = {'50': 'Network Down'}
+MOTU_critical = {'Errno 50': 'Network Down'}
 # FTP specific errors
 FTP_retry = {'999': 'add ftp retry errors here' }
 FTP_critical = {'999': 'add ftp critical errors here' }
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