diff --git a/src/primitives/transaction.cpp b/src/primitives/transaction.cpp
--- a/src/primitives/transaction.cpp
+++ b/src/primitives/transaction.cpp
@@ -114,7 +114,7 @@
     // are created.  We want to change in advance of spending them to
     // incentivize keeping your UTXO set reasonbly sized.
     int64_t modSize =
-        int64_t(nTxSize) + (int64_t(outputs) - int64_t(inputs)) * 179;
+        int64_t(nTxSize) + (int64_t(outputs) - int64_t(inputs)) * 1790;
 
     // Note: It is impossible to generate a negative number above in any real
     // world situation.  This is because the inputs have a least 179 byte
diff --git a/test/functional/test_framework/mininode.py b/test/functional/test_framework/mininode.py
--- a/test/functional/test_framework/mininode.py
+++ b/test/functional/test_framework/mininode.py
@@ -412,7 +412,7 @@
         for vout in self.vout:
             # Include the sizes for the outputs.
             tx_size += len(ToHex(vout))//2
-        tx_size += (len(self.vout) - len(self.vin))*179
+        tx_size += (len(self.vout) - len(self.vin))*1790
         return max(tx_size, 10 + 34 * len(self.vout))
 
     def serialize(self):