diff --git a/libs/ardour/rt_tasklist.cc b/libs/ardour/rt_tasklist.cc
index be9a5a79b5..bce81f80fb 100644
--- a/libs/ardour/rt_tasklist.cc
+++ b/libs/ardour/rt_tasklist.cc
@@ -93,7 +93,7 @@ RTTaskList::reset_thread_list ()
 			pthread_attr_init (&attr);
 			pthread_attr_setstacksize (&attr, PBD_RT_STACKSIZE_HELP);
 			if (pthread_create (&thread_id, &attr, _thread_run, this)) {
-				PBD::fatal << _("Cannot create thread for TaskList! (%s") << strerror(errno) << ')' << endmsg;
+				PBD::fatal << _("Cannot create thread for TaskList! (") << strerror(errno) << ')' << endmsg;
 				/* NOT REACHED */
 			}
 			pthread_attr_destroy (&attr);