diff --git a/src/sysprof/sysprof-files-dialog.c b/src/sysprof/sysprof-files-dialog.c
index 4232af8c..dff6cccf 100644
--- a/src/sysprof/sysprof-files-dialog.c
+++ b/src/sysprof/sysprof-files-dialog.c
@@ -104,6 +104,13 @@ sysprof_files_dialog_activate_cb (SysprofFilesDialog *self,
   gtk_window_present (window);
 }
 
+static char *
+format_size (gpointer unused,
+             guint64  size)
+{
+  return g_format_size (size);
+}
+
 static void
 sysprof_files_dialog_dispose (GObject *object)
 {
@@ -173,6 +180,7 @@ sysprof_files_dialog_class_init (SysprofFilesDialogClass *klass)
 
   gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/sysprof/sysprof-files-dialog.ui");
   gtk_widget_class_bind_template_callback (widget_class, sysprof_files_dialog_activate_cb);
+  gtk_widget_class_bind_template_callback (widget_class, format_size);
   gtk_widget_class_bind_template_child (widget_class, SysprofFilesDialog, column_view);
   gtk_widget_class_bind_template_child (widget_class, SysprofFilesDialog, path_column);
 }
diff --git a/src/sysprof/sysprof-files-dialog.ui b/src/sysprof/sysprof-files-dialog.ui
index 93ee4d96..8b5a8d66 100644
--- a/src/sysprof/sysprof-files-dialog.ui
+++ b/src/sysprof/sysprof-files-dialog.ui
@@ -20,7 +20,6 @@
             <child>
               <object class="GtkColumnView" id="column_view">
                 <signal name="activate" handler="sysprof_files_dialog_activate_cb" swapped="true"/>
-                <property name="show-column-separators">true</property>
                 <property name="show-row-separators">true</property>
                 <property name="model">
                   <object class="GtkNoSelection">
@@ -58,10 +57,6 @@
     <property name="child">
       <object class="GtkLabel">
         <property name="xalign">0</property>
-        <property name="margin-top">3</property>
-        <property name="margin-bottom">3</property>
-        <property name="margin-start">6</property>
-        <property name="margin-end">6</property>
         <binding name="label">
           <lookup name="path" type="SysprofDocumentFile">
             <lookup name="item">GtkListItem</lookup>
@@ -71,6 +66,42 @@
     </property>
   </template>
 </interface>
+]]>
+                        </property>
+                      </object>
+                    </property>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkColumnViewColumn" id="size_column">
+                    <property name="title" translatable="yes">Size</property>
+                    <property name="sorter">
+                      <object class="GtkNumericSorter">
+                        <property name="expression">
+                          <lookup name="size" type="SysprofDocumentFile"/>
+                        </property>
+                      </object>
+                    </property>
+                    <property name="factory">
+                      <object class="GtkBuilderListItemFactory">
+                        <property name="bytes"><![CDATA[
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <template class="GtkListItem">
+    <property name="child">
+      <object class="GtkLabel">
+        <property name="xalign">0</property>
+        <binding name="label">
+          <closure type="gchararray" function="format_size">
+            <lookup name="size" type="SysprofDocumentFile">
+              <lookup name="item">GtkListItem</lookup>
+            </lookup>
+          </closure>
+        </binding>
+      </object>
+    </property>
+  </template>
+</interface>
 ]]>
                         </property>
                       </object>