Mask not working

Hello. I am trying to synchronize only certain files from a folder to a local folder. Here is my code:

option confirm off
option batch abort
open sftp://seaice@icemonkey.gina.alaska.edu -privatekey=C:\Radar_config\icepirate.ppk
synchronize local "C:\Radar_data\1HrMotion\" /mnt/data/archive/radar-uaf-barrow-seaice-images/2015/02/19/
-filemask="*.png|*masked.png;*.tif" exit

It still grabs everything from the folder, I can't figure out why the masked.png and .tif files are not avoided. Thanks for your help.

The -filemask has to be on the same line as synchronize.