diff --git a/configure.in b/configure.in
index 2a095ff866..6a35c02c9d 100644
--- a/configure.in
+++ b/configure.in
@@ -32,7 +32,7 @@ m4_define([gtk_api_version], [2.0])
 m4_define([gtk_binary_version], [2.10.0])
 
 # required versions of other packages
-m4_define([glib_required_version], [2.30.0])
+m4_define([glib_required_version], [2.28.0])
 m4_define([pango_required_version], [1.20])
 m4_define([atk_required_version], [1.29.2])
 m4_define([cairo_required_version], [1.6])
diff --git a/gtk/gtkfilechooserdefault.c b/gtk/gtkfilechooserdefault.c
index 03e5b6e26d..9533ef8b5c 100644
--- a/gtk/gtkfilechooserdefault.c
+++ b/gtk/gtkfilechooserdefault.c
@@ -6705,7 +6705,11 @@ file_system_model_set (GtkFileSystemModel *model,
       if (info == NULL || _gtk_file_info_consider_as_directory (info))
         g_value_set_string (value, NULL);
       else
+#if GLIB_CHECK_VERSION(2,30,0)
         g_value_take_string (value, g_format_size (g_file_info_get_size (info)));
+#else
+        g_value_take_string (value, g_format_size_for_display (g_file_info_get_size (info)));
+#endif
       break;
     case MODEL_COL_MTIME:
     case MODEL_COL_MTIME_TEXT: