diff --git a/src/miner.h b/src/miner.h
--- a/src/miner.h
+++ b/src/miner.h
@@ -51,14 +51,12 @@
     explicit CTxMemPoolModifiedEntry(CTxMemPool::txiter entry) {
         iter = entry;
         nSizeWithAncestors = entry->GetSizeWithAncestors();
-        nBillableSizeWithAncestors = entry->GetBillableSizeWithAncestors();
         nModFeesWithAncestors = entry->GetModFeesWithAncestors();
         nSigOpCountWithAncestors = entry->GetSigOpCountWithAncestors();
     }
 
     CTxMemPool::txiter iter;
     uint64_t nSizeWithAncestors;
-    uint64_t nBillableSizeWithAncestors;
     Amount nModFeesWithAncestors;
     int64_t nSigOpCountWithAncestors;
 };
@@ -135,7 +133,6 @@
     void operator()(CTxMemPoolModifiedEntry &e) {
         e.nModFeesWithAncestors -= iter->GetFee();
         e.nSizeWithAncestors -= iter->GetTxSize();
-        e.nBillableSizeWithAncestors -= iter->GetTxBillableSize();
         e.nSigOpCountWithAncestors -= iter->GetSigOpCount();
     }
 
diff --git a/src/miner.cpp b/src/miner.cpp
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -398,7 +398,6 @@
             if (mit == mapModifiedTx.end()) {
                 CTxMemPoolModifiedEntry modEntry(desc);
                 modEntry.nSizeWithAncestors -= it->GetTxSize();
-                modEntry.nBillableSizeWithAncestors -= it->GetTxBillableSize();
                 modEntry.nModFeesWithAncestors -= it->GetModifiedFee();
                 modEntry.nSigOpCountWithAncestors -= it->GetSigOpCount();
                 mapModifiedTx.insert(modEntry);