diff --git a/src/MathWikibaseConfig.php b/src/MathWikibaseConfig.php
index d7f13daab..487603ee9 100644
--- a/src/MathWikibaseConfig.php
+++ b/src/MathWikibaseConfig.php
@@ -156,7 +156,7 @@ class MathWikibaseConfig {
 			}
 
 			self::$defaultConfig = new MathWikibaseConfig(
-				$wikibaseClient->getEntityIdParser(),
+				WikibaseClient::getEntityIdParser(),
 				$wikibaseClient->getStore()->getEntityRevisionLookup(),
 				$wikibaseClient->getLanguageFallbackLabelDescriptionLookupFactory(),
 				$site