diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index fb473158c..53b971809 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -469,10 +469,17 @@ extern char SMART_CHAIN_SYMBOL[];
 
 std::vector<uint256> CTxMemPool::removeExpired(unsigned int nBlockHeight)
 {
-    CBlockIndex *tipindex;
-    // Remove expired txs from the mempool
+    // Remove expired txs from the mempool. (Regression fix: the scan that populates
+    // transactionsToRemove had been dropped, making this a no-op, so expired txs -- which
+    // can never be mined -- were never evicted and accumulated without bound.)
     LOCK(cs);
     list<CTransaction> transactionsToRemove;
+    for (indexed_transaction_set::const_iterator it = mapTx.begin(); it != mapTx.end(); it++) {
+        const CTransaction& tx = it->GetTx();
+        if (IsExpiredTx(tx, nBlockHeight)) {
+            transactionsToRemove.push_back(tx);
+        }
+    }
 
     std::vector<uint256> ids;
     for (const CTransaction& tx : transactionsToRemove) {