diff --git a/src/txorphanage.h b/src/txorphanage.h
--- a/src/txorphanage.h
+++ b/src/txorphanage.h
@@ -23,7 +23,7 @@
     size_t list_pos;
 };
 
-int EraseOrphanTx(TxId id) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
+int EraseOrphanTx(const TxId &txid) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
 void EraseOrphansFor(NodeId peer);
 unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans);
 
diff --git a/src/txorphanage.cpp b/src/txorphanage.cpp
--- a/src/txorphanage.cpp
+++ b/src/txorphanage.cpp
@@ -24,8 +24,8 @@
 std::vector<std::map<TxId, COrphanTx>::iterator>
     g_orphan_list GUARDED_BY(g_cs_orphans);
 
-int EraseOrphanTx(TxId id) {
-    std::map<TxId, COrphanTx>::iterator it = mapOrphanTransactions.find(id);
+int EraseOrphanTx(const TxId &txid) {
+    std::map<TxId, COrphanTx>::iterator it = mapOrphanTransactions.find(txid);
     if (it == mapOrphanTransactions.end()) {
         return 0;
     }