diff --git a/src/WikibaseHook.php b/src/WikibaseHook.php
index 26fa97a93..9e778be1b 100644
--- a/src/WikibaseHook.php
+++ b/src/WikibaseHook.php
@@ -2,10 +2,7 @@
 
 namespace MediaWiki\Extension\Math;
 
-use ParserOptions;
 use ValueFormatters\FormatterOptions;
-use ValueParsers\StringParser;
-use Wikibase\Repo\Parsers\WikibaseStringValueNormalizer;
 use Wikibase\Repo\Rdf\DedupeBag;
 use Wikibase\Repo\Rdf\EntityMentionListener;
 use Wikibase\Repo\Rdf\RdfVocabulary;
@@ -38,10 +35,6 @@ class WikibaseHook {
 				$validators[] = new MathValidator();
 				return $validators;
 			},
-			'parser-factory-callback' => static function ( ParserOptions $options ) {
-				$normalizer = new WikibaseStringValueNormalizer( WikibaseRepo::getStringNormalizer() );
-				return new StringParser( $normalizer );
-			},
 			'formatter-factory-callback' => static function ( $format, FormatterOptions $options ) {
 				return new MathFormatter( $format );
 			},