diff --git a/b2/db.c b/b2/db.c
index 96fc525..df793d9 100644
--- a/b2/db.c
+++ b/b2/db.c
@@ -55,6 +55,8 @@ struct part *part_add(const char *domain, const char *name)
 	struct part part = {
 		.domain = domain,
 		.name = name,
+		.param = NULL,
+		.stock = NULL,
 	};
 	struct part *p;
 
@@ -63,7 +65,7 @@ struct part *part_add(const char *domain, const char *name)
 	p = g_tree_lookup(tree, &part);
 	if (!p) {
 		p = alloc_type(struct part);
-		p->stock = NULL;
+		*p = part;
 		p->next = p->prev = p;
 		g_tree_insert(tree, p, p);
 	}