use &

diff --git a/modules/lmdbbackend/lmdbbackend.cc b/modules/lmdbbackend/lmdbbackend.cc
index d5f9c2f77a61d4b64e2c1131def6b7e272857beb..dcaf1ae125e70c0f55c463964498db72b714c158 100644 (file)
--- a/modules/lmdbbackend/lmdbbackend.cc
+++ b/modules/lmdbbackend/lmdbbackend.cc
@@ -1303,7 +1303,7 @@ bool LMDBBackend::deleteDomain(const DNSName& domain)
 
     txn.get_multi<0>(domain, ids);
 
-    for (auto _id : ids) {
+    for (auto &_id : ids) {
       txn.del(_id);
     }