diff --git a/node/config/def.go b/node/config/def.go
index 3be7733679b..13af3efb92c 100644
--- a/node/config/def.go
+++ b/node/config/def.go
@@ -191,6 +191,7 @@ func DefaultStorageMiner() *StorageMiner {
 			MaxSealingSectors:         0,
 			MaxSealingSectorsForDeals: 0,
 			WaitDealsDelay:            Duration(time.Hour * 6),
+			AlwaysKeepUnsealedCopy:    true,
 		},
 
 		Storage: sectorstorage.SealerConfig{