diff --git a/filter/algebra/algebradebug.php b/filter/algebra/algebradebug.php
index c5af44fe180e8..8732a8a776bb0 100644
--- a/filter/algebra/algebradebug.php
+++ b/filter/algebra/algebradebug.php
@@ -325,7 +325,7 @@ function tex2image($texexp, $md5) {
 <br /><?PHP echo "case &quot;" . PHP_OS . "&quot;:" ;?><br ?> to the list of operating systems
 in the switch (PHP_OS) statement. Windows users may have a problem properly
 unzipping mimetex.exe. Make sure that mimetex.exe is is <b>PRECISELY</b>
-328192 bytes in size. If not, download fresh copy from
+329728 bytes in size. If not, download fresh copy from
 <a href="http://moodle.org/download/mimetex/windows/mimetex.exe">
 http://moodle.org/download/mimetex/windows/mimetex.exe</a>. Lastly check
 the execute permissions on your mimetex binary, as outlined in item 2 above.</li>