diff --git a/pmd/etc/ruleset_xml_schema.xsd b/pmd/etc/ruleset_xml_schema.xsd
index 7de58e6f40..7b0e5dc7db 100644
--- a/pmd/etc/ruleset_xml_schema.xsd
+++ b/pmd/etc/ruleset_xml_schema.xsd
@@ -41,6 +41,7 @@
       <xs:attribute name="message" type="xs:string" use="optional" />
       <xs:attribute name="externalInfoUrl" type="xs:string" use="optional" />
       <xs:attribute name="class" type="xs:NMTOKEN" use="optional" />
+      <xs:attribute name="typeResolution" type="xs:boolean" default="false" use="optional" />
     </xs:complexType>
   </xs:element>