diff --git a/lib/galaxy/tool_util/xsd/galaxy.xsd b/lib/galaxy/tool_util/xsd/galaxy.xsd
index d0cc160e0737..01ac39775ac3 100644
--- a/lib/galaxy/tool_util/xsd/galaxy.xsd
+++ b/lib/galaxy/tool_util/xsd/galaxy.xsd
@@ -7275,7 +7275,6 @@ A tool can refer multiple reference IDs.
    <xrefs>
        <xref type="bio.tools">dada2</xref>
        <xref type="bioconductor">dada2</xref>
-       <xref type="biii">dada2</xref>
    </xrefs>
    <!-- https://bio.tools/dada2 -->
 ```