diff --git a/MathRenderer.php b/MathRenderer.php
index c214a23..6784ff4 100644
--- a/MathRenderer.php
+++ b/MathRenderer.php
@@ -610,7 +610,7 @@ abstract class MathRenderer {
 			// equation was already checked or checking is disabled
 			return true;
 		} else {
-			if( (int) $wgMathDisableTexFilter == MW_MATH_CHECK_NEW ){
+			if( (int) $wgMathDisableTexFilter == MW_MATH_CHECK_NEW && $this->mode != MW_MATH_SOURCE ){
 				if( $this->readFromDatabase() ){
 					return true;
 				}
diff --git a/MathSource.php b/MathSource.php
index 3ad43d6..95340ac 100644
--- a/MathSource.php
+++ b/MathSource.php
@@ -19,6 +19,15 @@
  * @ingroup Parser
  */
 class MathSource extends MathRenderer {
+	/**
+	 * @param string $tex
+	 * @param array $params
+	 */
+	function __construct( $tex = '', $params = array() ) {
+		parent::__construct( $tex, $params );
+		$this->setMode( MW_MATH_SOURCE );
+	}
+
 	/**
 	 * Renders TeX by outputting it to the browser in a span tag
 	 *