diff --git a/thunar/thunar-size-label.c b/thunar/thunar-size-label.c
index 1e27e050b2604ae0b0fa5df1ada7d47dc396273b..06f06ed27b351b7cd3d97683da014a1f1867ca9c 100644
--- a/thunar/thunar-size-label.c
+++ b/thunar/thunar-size-label.c
@@ -122,7 +122,7 @@ thunar_size_label_class_init (ThunarSizeLabelClass *klass)
                                    PROP_FILES,
                                    g_param_spec_boxed ("files", "files", "files",
                                                        THUNARX_TYPE_FILE_INFO_LIST,
-                                                       EXO_PARAM_WRITABLE));
+                                                       EXO_PARAM_READWRITE));
 }