diff --git a/MathRenderer.php b/MathRenderer.php
index 0a99a5e..1fe7ba7 100644
--- a/MathRenderer.php
+++ b/MathRenderer.php
@@ -572,7 +572,7 @@ abstract class MathRenderer {
 					return true;
 				}
 			}
-			$checker = new MathInputCheckTexvc( $this->userInputTex );
+			$checker = new MathInputCheckRestbase( $this->userInputTex );
 			if ( $checker->isValid() ) {
 				$this->setTex( $checker->getValidTex() );
 				$this->texSecure = true;
diff --git a/tests/MathRendererTest.php b/tests/MathRendererTest.php
index 1ac899d..4ab6e68 100644
--- a/tests/MathRendererTest.php
+++ b/tests/MathRendererTest.php
@@ -8,6 +8,25 @@ class MathRendererTest extends MediaWikiTestCase {
 	const SOME_TEX = "a+b";
 	const TEXVCCHECK_INPUT = '\forall \epsilon \exist \delta';
 	const TEXVCCHECK_OUTPUT = '\forall \epsilon \exists \delta '; // be aware of the s at exists
+
+	protected static $hasRestbase;
+
+	public static function setUpBeforeClass() {
+		$rbi = new MathRestbaseInterface();
+		self::$hasRestbase = $rbi->checkBackend( true );
+	}
+
+	/**
+	 * Sets up the fixture, for example, opens a network connection.
+	 * This method is called before a test is executed.
+	 */
+	protected function setUp() {
+		parent::setUp();
+		if ( !self::$hasRestbase ) {
+			$this->markTestSkipped( "Can not connect to Restbase Math interface." );
+		}
+	}
+
 	/**
 	 * Checks the tex and hash functions
 	 * @covers MathRenderer::getTex()