diff --git a/lib/galaxy/config/sample/datatypes_conf.xml.sample b/lib/galaxy/config/sample/datatypes_conf.xml.sample
index 76e1059b8c6f..143e48a96aa0 100644
--- a/lib/galaxy/config/sample/datatypes_conf.xml.sample
+++ b/lib/galaxy/config/sample/datatypes_conf.xml.sample
@@ -567,8 +567,7 @@
     <!-- Excel datatypes -->
     <datatype extension="excel.xls" type="galaxy.datatypes.binary:ExcelXls" display_in_upload="true"/>
     <datatype extension="xlsx" type="galaxy.datatypes.binary:Xlsx" display_in_upload="true"/>
-    <!-- Word datatypes -->
-    <datatype extension="docx" type="galaxy.datatypes.binary:Binary"/>
+    <datatype extension="docx" type="galaxy.datatypes.binary:Binary" subclass="true"/>
     <datatype extension="btwisted" type="galaxy.datatypes.data:Text" subclass="true"/>
     <datatype extension="cai" type="galaxy.datatypes.data:Text" subclass="true"/>
     <datatype extension="cat_db" type="galaxy.datatypes.data:Text" subclass="true"/>