diff --git a/MathRenderer.php b/MathRenderer.php
index 58a317a..8e46583 100644
--- a/MathRenderer.php
+++ b/MathRenderer.php
@@ -76,6 +76,9 @@ abstract class MathRenderer {
 		$this->userInputTex = $tex;
 		$this->tex = $tex;
 		$this->params = $params;
+		if ( isset( $params['id'] ) ) {
+			$this->id = $params['id'];
+		}
 	}
 
 	/**
@@ -139,10 +142,7 @@ abstract class MathRenderer {
 				$tex = '{\textstyle ' . $tex . '}';
 			}
 		}
-		$id = null;
-		if ( isset( $params['id'] ) ) {
-			$id = $params['id'];
-		}
+
 		if ( isset( $params['forcemathmode'] ) ) {
 			$mode = $params['forcemathmode'];
 		}
diff --git a/tests/MathIdTest.php b/tests/MathIdTest.php
new file mode 100644
index 0000000..c7c5719
--- /dev/null
+++ b/tests/MathIdTest.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * Test the Id feature
+ * @group Math
+ */
+class MathIdTest extends MediaWikiTestCase {
+
+	/**
+	 * Checks if the id specified as attribute is set in the renderer object
+	 */
+	public function testBasics() {
+		define( 'RANDOM_ID', 'a_random_id' );
+		$renderer = MathRenderer::getRenderer( "a+b", array( 'id' => RANDOM_ID ) );
+		$this->assertEquals( RANDOM_ID, $renderer->getId() );
+	}
+
+}
\ No newline at end of file