diff --git a/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml b/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
index 97ded057092f..277278772274 100644
--- a/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
+++ b/components/mpas-ocean/bld/namelist_files/namelist_defaults_mpaso.xml
@@ -365,7 +365,7 @@
 <config_remove_ais_river_runoff>.false.</config_remove_ais_river_runoff>
 <config_remove_ais_ice_runoff>.false.</config_remove_ais_ice_runoff>
 <config_scale_dismf_by_removed_ice_runoff>.false.</config_scale_dismf_by_removed_ice_runoff>
-<config_ais_ice_runoff_history_days>7301</config_ais_ice_runoff_history_days>
+<config_ais_ice_runoff_history_days>731</config_ais_ice_runoff_history_days>
 
 <!-- shortwaveRadiation -->
 <config_sw_absorption_type>'jerlov'</config_sw_absorption_type>
diff --git a/components/mpas-ocean/bld/namelist_files/namelist_definition_mpaso.xml b/components/mpas-ocean/bld/namelist_files/namelist_definition_mpaso.xml
index ad9fd84633d3..46bbfde1f873 100644
--- a/components/mpas-ocean/bld/namelist_files/namelist_definition_mpaso.xml
+++ b/components/mpas-ocean/bld/namelist_files/namelist_definition_mpaso.xml
@@ -1281,7 +1281,7 @@ Default: Defined in namelist_defaults.xml
 
 <entry id="config_ais_ice_runoff_history_days" type="integer"
 	category="coupling" group="coupling">
-The number of days over for which the history of removed AIS runoff is stored. The default is 7301 days (20 years + 1 day).
+The number of days over for which the history of removed AIS runoff is stored. The default is 731 days (2 years + 1 day).
 
 Valid values: Any positive integer
 Default: Defined in namelist_defaults.xml
diff --git a/components/mpas-ocean/src/Registry.xml b/components/mpas-ocean/src/Registry.xml
index 151e3181eda6..f230276dca81 100644
--- a/components/mpas-ocean/src/Registry.xml
+++ b/components/mpas-ocean/src/Registry.xml
@@ -814,8 +814,8 @@
 					description="Whether to scale data ice-shelf melt fluxes by the running mean of removed ice runoff."
 					possible_values=".true. or .false."
 		/>
-		<nml_option name="config_ais_ice_runoff_history_days" type="integer" default_value="7301"
-					description="The number of days over for which the history of removed AIS runoff is stored. The default is 7301 days (20 years + 1 day)."
+		<nml_option name="config_ais_ice_runoff_history_days" type="integer" default_value="731"
+					description="The number of days over for which the history of removed AIS runoff is stored. The default is 731 days (2 years + 1 day)."
 					possible_values="Any positive integer"
 		/>
 	</nml_record>