diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index b242580b1..8725b5d00 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -1341,7 +1341,7 @@ void ListTransactions(const CWalletTx& wtx, const string& strAccount, int nMinDe
             entry.push_back(Pair("fee", ValueFromAmount(-nFee)));
             if (fLong)
                 WalletTxToJSON(wtx, entry);
-            entry.push_back(Pair("size", static_cast<CTransaction>(wtx).GetSerializeSize(SER_NETWORK, PROTOCOL_VERSION)));
+            entry.push_back(Pair("size", static_cast<uint64_t>(static_cast<CTransaction>(wtx).GetSerializeSize(SER_NETWORK, PROTOCOL_VERSION))));
             ret.push_back(entry);
         }
     }
@@ -1378,7 +1378,7 @@ void ListTransactions(const CWalletTx& wtx, const string& strAccount, int nMinDe
                 entry.push_back(Pair("vout", r.vout));
                 if (fLong)
                     WalletTxToJSON(wtx, entry);
-                entry.push_back(Pair("size", static_cast<CTransaction>(wtx).GetSerializeSize(SER_NETWORK, PROTOCOL_VERSION)));
+                entry.push_back(Pair("size", static_cast<uint64_t>(static_cast<CTransaction>(wtx).GetSerializeSize(SER_NETWORK, PROTOCOL_VERSION))));
                 ret.push_back(entry);
             }
         }
@@ -3748,9 +3748,9 @@ UniValue z_shieldcoinbase(const UniValue& params, bool fHelp)
 
     // Return continuation information
     UniValue o(UniValue::VOBJ);
-    o.push_back(Pair("remainingUTXOs", utxoCounter - numUtxos));
+    o.push_back(Pair("remainingUTXOs", static_cast<uint64_t>(utxoCounter - numUtxos)));
     o.push_back(Pair("remainingValue", ValueFromAmount(remainingValue)));
-    o.push_back(Pair("shieldingUTXOs", numUtxos));
+    o.push_back(Pair("shieldingUTXOs", static_cast<uint64_t>(numUtxos)));
     o.push_back(Pair("shieldingValue", ValueFromAmount(shieldedValue)));
     o.push_back(Pair("opid", operationId));
     return o;
@@ -4086,13 +4086,13 @@ UniValue z_mergetoaddress(const UniValue& params, bool fHelp)
 
     // Return continuation information
     UniValue o(UniValue::VOBJ);
-    o.push_back(Pair("remainingUTXOs", utxoCounter - numUtxos));
+    o.push_back(Pair("remainingUTXOs", static_cast<uint64_t>(utxoCounter - numUtxos)));
     o.push_back(Pair("remainingTransparentValue", ValueFromAmount(remainingUTXOValue)));
-    o.push_back(Pair("remainingNotes", noteCounter - numNotes));
+    o.push_back(Pair("remainingNotes", static_cast<uint64_t>(noteCounter - numNotes)));
     o.push_back(Pair("remainingShieldedValue", ValueFromAmount(remainingNoteValue)));
-    o.push_back(Pair("mergingUTXOs", numUtxos));
+    o.push_back(Pair("mergingUTXOs", static_cast<uint64_t>(numUtxos)));
     o.push_back(Pair("mergingTransparentValue", ValueFromAmount(mergedUTXOValue)));
-    o.push_back(Pair("mergingNotes", numNotes));
+    o.push_back(Pair("mergingNotes", static_cast<uint64_t>(numNotes)));
     o.push_back(Pair("mergingShieldedValue", ValueFromAmount(mergedNoteValue)));
     o.push_back(Pair("opid", operationId));
     return o;