diff --git a/gdbus/object.c b/gdbus/object.c
index 8301753..49b5780 100644
--- a/gdbus/object.c
+++ b/gdbus/object.c
@@ -1346,9 +1346,15 @@ gboolean g_dbus_register_interface(DBusConnection *connection,
 {
 	struct generic_data *data;
 
-	if (!dbus_validate_path(path, NULL) ||
-				!dbus_validate_interface(name, NULL))
+	if (!dbus_validate_path(path, NULL)) {
+		error("Invalid object path: %s", path);
 		return FALSE;
+	}
+
+	if (!dbus_validate_interface(name, NULL)) {
+		error("Invalid interface: %s", name);
+		return FALSE;
+	}
 
 	data = object_path_ref(connection, path);
 	if (data == NULL)