diff --git a/nomad/state/state_store.go b/nomad/state/state_store.go
index e11ed85c807..882e1773a4f 100644
--- a/nomad/state/state_store.go
+++ b/nomad/state/state_store.go
@@ -466,6 +466,7 @@ func (s *StateStore) UpsertPlanResults(msgType structs.MessageType, index uint64
 
 	// handle upgrade path
 	for _, alloc := range allocsToUpsert {
+		alloc = alloc.Copy()
 		alloc.Canonicalize()
 	}