diff --git a/data/xsd/tllogic_file.xsd b/data/xsd/tllogic_file.xsd
index 6fd152ab078b..0fbc9094638f 100644
--- a/data/xsd/tllogic_file.xsd
+++ b/data/xsd/tllogic_file.xsd
@@ -26,7 +26,7 @@
         <xsd:attribute name="fromLane" type="xsd:nonNegativeInteger" use="required"/>
         <xsd:attribute name="toLane" type="xsd:nonNegativeInteger" use="required"/>
         <xsd:attribute name="tl" type="xsd:string" use="optional"/>
-        <xsd:attribute name="linkIndex" type="xsd:integer" use="required"/>
+        <xsd:attribute name="linkIndex" type="xsd:integer" use="optional"/>
     </xsd:complexType>
 
 </xsd:schema>