diff --git a/filter/tex/texdebug.php b/filter/tex/texdebug.php
index 4cd5f961162..bbeb81f134e 100644
--- a/filter/tex/texdebug.php
+++ b/filter/tex/texdebug.php
@@ -1,4 +1,4 @@
-<?PHP // $Id$
+<?php // $Id$
       // This function fetches math. images from the data directory
       // If not, it obtains the corresponding TeX expression from the cache_tex db table
       // and uses mimeTeX to create the image file
@@ -293,7 +293,7 @@
                <label for="ShowDB">See the cache_filters database entry for this expression (if any).</label></li>
            <li><input type="radio" name="DeleteDB" value="DeleteDB" id="DeleteDB" />
                <label for="DeleteDB">Delete the cache_filters database entry for this expression (if any).</label></li>
-           <li><input type="radio" name="action" value="ShowImageMimetex" id="ShowImageMimetex  checked="checked" />
+           <li><input type="radio" name="action" value="ShowImageMimetex" id="ShowImageMimetex"  checked="checked" />
                <label for="ShowImageMimetex">Show a graphic image of the algebraic expression rendered with mimetex.</label></li>
            <li><input type="radio" name="action" value="ShowImageTex" id="ShowImageTex" />
                <label for="ShowImageTex">Show a graphic image of the algebraic expression rendered with Tex/Ghostscript.</label></li>