diff --git a/ice_in b/ice_in
index e0d7e4c..a8a7c1d 100644
--- a/ice_in
+++ b/ice_in
@@ -7,6 +7,7 @@
   histfreq = "d", "m", "x", "x", "x"
   hist_time_axis = "middle"
   history_deflate = 1
+  history_chunksize = 720, 540
   history_precision = 8
   restart_deflate = 1
   ice_ic = 'default'