1 files changed, 2 insertions, 0 deletions
diff --git a/set.c b/set.c
index ec18b82d..ff2470b6 100644
--- a/set.c
+++ b/set.c
@@ -63,6 +63,8 @@ set_t *set_add(set_t **head, const char *key, const char *def, set_eval eval, vo
 	}
 	if (def) {
 		s->def = g_strdup(def);
+	} else {
+		s->flags |= SET_NULL_OK;
 	}
 
 	s->eval = eval;