diff --git a/libfwupd/fwupd-bios-attr.c b/libfwupd/fwupd-bios-attr.c
index 5927ea3fa..711c804a5 100644
--- a/libfwupd/fwupd-bios-attr.c
+++ b/libfwupd/fwupd-bios-attr.c
@@ -540,6 +540,10 @@ fwupd_bios_attr_to_variant(FwupdBiosAttr *self)
 				      FWUPD_RESULT_KEY_DESCRIPTION,
 				      g_variant_new_string(priv->description));
 	}
+	g_variant_builder_add(&builder,
+			      "{sv}",
+			      FWUPD_RESULT_KEY_BIOS_ATTR_READ_ONLY,
+			      g_variant_new_boolean(priv->read_only));
 	g_variant_builder_add(&builder,
 			      "{sv}",
 			      FWUPD_RESULT_KEY_BIOS_ATTR_CURRENT_VALUE,