diff --git a/lib/galaxy/webapps/reports/controllers/system.py b/lib/galaxy/webapps/reports/controllers/system.py
index 1ef8f591073..8979318490b 100644
--- a/lib/galaxy/webapps/reports/controllers/system.py
+++ b/lib/galaxy/webapps/reports/controllers/system.py
@@ -40,7 +40,8 @@ class System( BaseUIController ):
                                     userless_histories_days=userless_histories_days,
                                     deleted_histories_days=deleted_histories_days,
                                     deleted_datasets_days=deleted_datasets_days,
-                                    message=message )
+                                    message=message,
+                                    nice_size=nice_size )
     def userless_histories( self, trans, **kwd ):
         """The number of userless histories and associated datasets that have not been updated for the specified number of days."""
         params = util.Params( kwd )
diff --git a/templates/webapps/reports/system.mako b/templates/webapps/reports/system.mako
index 2bace12ee17..f0f915cb511 100644
--- a/templates/webapps/reports/system.mako
+++ b/templates/webapps/reports/system.mako
@@ -83,7 +83,7 @@
                     </td>
                     <td>${time_ago( dataset.update_time )}</td>
                     <td>${dataset.deleted}</td>
-                    <td>${dataset.file_size}</td>
+                    <td>${nice_size( dataset.file_size, True )}</td>
                 </tr>
                 <% ctr += 1 %>
             %endfor