diff --git a/src/slurmctld/read_config.c b/src/slurmctld/read_config.c
index fd3184023084b020091cd0bd3350a3323f9edd1a..245266718366264b682e4a0af75aa8af4fe11739 100644
--- a/src/slurmctld/read_config.c
+++ b/src/slurmctld/read_config.c
@@ -1337,6 +1337,7 @@ static int _update_preempt(uint16_t old_preempt_mode)
 		return gs_fini();
 	}
 
+	error("Invalid gang scheduling mode change");
 	return EINVAL;
 }