diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 18b6d49d1..987c8b286 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -3854,7 +3854,6 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
     {
       std::stringstream prompt;
       double worst_fee_per_byte = std::numeric_limits<double>::max();
-      uint64_t size = 0, fee = 0;
       for (size_t n = 0; n < ptx_vector.size(); ++n)
       {
         const uint64_t blob_size = cryptonote::tx_to_blob(ptx_vector[n].tx).size();
@@ -3862,13 +3861,11 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
         if (fee_per_byte < worst_fee_per_byte)
         {
           worst_fee_per_byte = fee_per_byte;
-          fee = ptx_vector[n].fee;
         }
-        size += blob_size;
       }
       try
       {
-        std::vector<std::pair<uint64_t, uint64_t>> nblocks = m_wallet->estimate_backlog(size, size, {fee});
+        std::vector<std::pair<uint64_t, uint64_t>> nblocks = m_wallet->estimate_backlog({std::make_pair(worst_fee_per_byte, worst_fee_per_byte)});
         if (nblocks.size() != 1)
         {
           prompt << "Internal error checking for backlog. " << tr("Is this okay anyway?  (Y/Yes/N/No): ");