diff --git a/filter/tex/texdebug.php b/filter/tex/texdebug.php
index 3b2ad1e21b3..ce54e08b29e 100644
--- a/filter/tex/texdebug.php
+++ b/filter/tex/texdebug.php
@@ -254,6 +254,7 @@
         $gif = "$latex->temp_dir/$md5.gif";
 
         // put the expression as a file into the temp area
+        $expression = stripslashes( $expression );
         $expression = html_entity_decode( $expression );
         $output .= "<p>Processing TeX expression:</p><pre>$expression</pre>\n";
         $doc = $latex->construct_latex_document( $expression );