diff --git a/lib/galaxy/tool_util/xsd/galaxy.xsd b/lib/galaxy/tool_util/xsd/galaxy.xsd
index 01ac39775ac..445dbe1be17 100644
--- a/lib/galaxy/tool_util/xsd/galaxy.xsd
+++ b/lib/galaxy/tool_util/xsd/galaxy.xsd
@@ -5282,12 +5282,20 @@ on Human (hg18)``.
 
   <xs:group name="OutputCollectionElement">
     <xs:choice>
-      <xs:element name="data" type="OutputData" />
+      <xs:element name="data" type="OutputCollectionDataElement" />
       <xs:element name="discover_datasets" type="OutputCollectionDiscoverDatasets" />
       <xs:element name="filter" type="OutputFilter" />
     </xs:choice>
   </xs:group>
 
+  <xs:complexType name="OutputCollectionDataElement">
+    <xs:sequence>
+      <xs:group ref="OutputCollectionElement" minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="OutputCommon" />
+    <xs:attributeGroup ref="OutputDataAttributes" />
+  </xs:complexType>
+
   <xs:complexType name="OutputCollection">
     <xs:annotation>
       <xs:documentation xml:lang="en"><![CDATA[
@@ -5335,7 +5343,6 @@ This tag describes an output to the tool.
     </xs:annotation>
     <xs:sequence>
       <xs:group ref="OutputDataElement" minOccurs="0" maxOccurs="unbounded" />
-      <xs:group ref="OutputCollectionElement" minOccurs="0" maxOccurs="unbounded" />
     </xs:sequence>
     <xs:attributeGroup ref="OutputCommon"/>
     <xs:attributeGroup ref="OutputCollectionAttributes"/>