diff --git a/drivers/md/persistent-data/dm-btree-internal.h b/drivers/md/persistent-data/dm-btree-internal.h
index a240990a7f33..55a4096f1334 100644
--- a/drivers/md/persistent-data/dm-btree-internal.h
+++ b/drivers/md/persistent-data/dm-btree-internal.h
@@ -68,7 +68,7 @@ struct ro_spine {
 };
 
 void init_ro_spine(struct ro_spine *s, struct dm_btree_info *info);
-int exit_ro_spine(struct ro_spine *s);
+void exit_ro_spine(struct ro_spine *s);
 int ro_step(struct ro_spine *s, dm_block_t new_child);
 void ro_pop(struct ro_spine *s);
 struct btree_node *ro_node(struct ro_spine *s);
diff --git a/drivers/md/persistent-data/dm-btree-spine.c b/drivers/md/persistent-data/dm-btree-spine.c
index b27b8091a1ca..e03cb9e48773 100644
--- a/drivers/md/persistent-data/dm-btree-spine.c
+++ b/drivers/md/persistent-data/dm-btree-spine.c
@@ -132,15 +132,13 @@ void init_ro_spine(struct ro_spine *s, struct dm_btree_info *info)
 	s->nodes[1] = NULL;
 }
 
-int exit_ro_spine(struct ro_spine *s)
+void exit_ro_spine(struct ro_spine *s)
 {
-	int r = 0, i;
+	int i;
 
 	for (i = 0; i < s->count; i++) {
 		unlock_block(s->info, s->nodes[i]);
 	}
-
-	return r;
 }
 
 int ro_step(struct ro_spine *s, dm_block_t new_child)