diff --git a/src/txmempool.h b/src/txmempool.h
index 533fbe949..864a0c97e 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -19,6 +19,7 @@
 #undef foreach
 #include "boost/multi_index_container.hpp"
 #include "boost/multi_index/ordered_index.hpp"
+#include "boost/multi_index/hashed_index.hpp"
 
 class CAutoFile;
 class CBlockIndex;
@@ -424,7 +425,7 @@ public:
         CTxMemPoolEntry,
         boost::multi_index::indexed_by<
             // sorted by txid
-            boost::multi_index::ordered_unique<mempoolentry_txid>,
+            boost::multi_index::hashed_unique<mempoolentry_txid, SaltedTxidHasher>,
             // sorted by fee rate
             boost::multi_index::ordered_non_unique<
                 boost::multi_index::tag<descendant_score>,