diff --git a/Math.hooks.php b/Math.hooks.php
index 54622cd..c71c959 100644
--- a/Math.hooks.php
+++ b/Math.hooks.php
@@ -92,7 +92,6 @@ class MathHooks {
 	 * @return array
 	 */
 	static function mathTagHook( $content, $attributes, $parser ) {
-		global $wgMathDisableTexFilter;
 
 		if ( trim( $content ) === '' ) { // bug 8372
 			return '';