diff --git a/src/symfony/src/Resources/config/doctrine-mapping/PublicKeyCredentialSource.orm.xml b/src/symfony/src/Resources/config/doctrine-mapping/PublicKeyCredentialSource.orm.xml
index 90cb8e58..441f288e 100644
--- a/src/symfony/src/Resources/config/doctrine-mapping/PublicKeyCredentialSource.orm.xml
+++ b/src/symfony/src/Resources/config/doctrine-mapping/PublicKeyCredentialSource.orm.xml
@@ -5,6 +5,9 @@
     xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping https://raw.github.com/doctrine/doctrine2/master/doctrine-mapping.xsd"
 >
     <mapped-superclass name="Webauthn\PublicKeyCredentialSource">
+        <indexes>
+            <index name="pkcid_idx" columns="publicKeyCredentialId"/>
+        </indexes>
         <field name="publicKeyCredentialId" type="base64"/>
         <field name="type"/>
         <field name="transports" type="json"/>