diff --git a/phpunit/multisite.xml b/phpunit/multisite.xml
index 279c1561d9136e..23de57aa1d9bd8 100644
--- a/phpunit/multisite.xml
+++ b/phpunit/multisite.xml
@@ -10,6 +10,7 @@
 	<php>
 		<env name="WP_MULTISITE" value="1" />
 		<env name="WORDPRESS_TABLE_PREFIX" value="wptests_" />
+		<const name="FONTS_LIBRARY_ENABLE" value="true"/>
 	</php>
 	<testsuites>
 		<testsuite name="default">