diff --git a/lib/galaxy/config/sample/datatypes_conf.xml.sample b/lib/galaxy/config/sample/datatypes_conf.xml.sample
index f5665537a41..c712f074ace 100644
--- a/lib/galaxy/config/sample/datatypes_conf.xml.sample
+++ b/lib/galaxy/config/sample/datatypes_conf.xml.sample
@@ -115,7 +115,7 @@
     <datatype extension="bowtie_base_index" type="galaxy.datatypes.ngsindex:BowtieBaseIndex" mimetype="text/html" display_in_upload="false"/>
     <datatype extension="csfasta" type="galaxy.datatypes.sequence:csFasta" display_in_upload="true"/>
     <datatype extension="data" type="galaxy.datatypes.data:Data" mimetype="application/octet-stream" max_optional_metadata_filesize="1048576"/>
-    <datatype extension="gz" type="galaxy.datatypes.binary:Binary" mimetype="application/octet-stream" max_optional_metadata_filesize="1048576"/>
+    <datatype extension="gz" type="galaxy.datatypes.binary:Binary" subclass="true"/>
     <datatype extension="binary" type="galaxy.datatypes.binary:Binary" mimetype="application/octet-stream" max_optional_metadata_filesize="1048576"/>
     <datatype extension="d3_hierarchy" type="galaxy.datatypes.text:Json" mimetype="application/json" subclass="true" display_in_upload="true"/>
     <datatype extension="imgt.json" type="galaxy.datatypes.text:ImgtJson" mimetype="application/json" display_in_upload="True"/>