diff --git a/src/neo/Ledger/MemoryPool.cs b/src/neo/Ledger/MemoryPool.cs
index cdc22b9738..b0407ca77a 100644
--- a/src/neo/Ledger/MemoryPool.cs
+++ b/src/neo/Ledger/MemoryPool.cs
@@ -329,7 +329,7 @@ private bool CheckConflicts(Transaction tx)
                 if (_unsortedTransactions.TryGetValue(hash, out PoolItem item))
                 {
                     if (!tx.Signers.Select(p => p.Account).Contains(item.Tx.Sender)) return false;
-                    if (tx.NetworkFee < item.Tx.NetworkFee) return false;
+                    if (tx.NetworkFee <= item.Tx.NetworkFee) return false;
                     to_removed.Add(item);
                 }
             }