diff --git a/examples/size_debugger.php b/examples/size_debugger.php
index 3aecc93d0..778129453 100644
--- a/examples/size_debugger.php
+++ b/examples/size_debugger.php
@@ -30,7 +30,7 @@
     $fields[] = [4*$scriptSize, "\tscript\t".$input->getScript()->getHex()];
     $fields[] = [4*4, "\tseq\t".$input->getSequence()];
 }
-$fields[] = [Buffertools::numToVarInt(count($tx->getOutputs()))->getSize(), 'nOut'];
+$fields[] = [4*Buffertools::numToVarInt(count($tx->getOutputs()))->getSize(), 'nOut'];
 foreach ($tx->getOutputs() as $output) {
     $script = $output->getScript();
     $scriptSize = $script->getBuffer()->getSize();