diff --git a/src/transaction_builder.cpp b/src/transaction_builder.cpp
index 76ba42302..893c292c7 100644
--- a/src/transaction_builder.cpp
+++ b/src/transaction_builder.cpp
@@ -150,7 +150,7 @@ boost::optional<CTransaction> TransactionBuilder::Build()
         change -= tOut.nValue;
     }
     if (change < 0) {
-        LogPrintf("%s: negative change!\n", __func__);
+        LogPrintf("%s: negative change=%lu!\n", __func__, change);
         return boost::none;
     }