diff --git a/status/explicit-failures.xsd b/status/explicit-failures.xsd
index 6c77750720..fc7bcc9418 100644
--- a/status/explicit-failures.xsd
+++ b/status/explicit-failures.xsd
@@ -4,9 +4,9 @@
     <xs:element name="explicit-failures-markup">
         <xs:complexType>
             <xs:sequence>
-                <xs:element ref="mark-toolset" maxOccurs="unbounded"/>
-                <xs:element ref="library" maxOccurs="unbounded"/>
-                <xs:element ref="note" maxOccurs="unbounded"/>
+                <xs:element ref="mark-toolset" minOccurs="0" maxOccurs="unbounded"/>
+                <xs:element ref="library" minOccurs="0" maxOccurs="unbounded"/>
+                <xs:element ref="note" minOccurs="0" maxOccurs="unbounded"/>
             </xs:sequence>
         </xs:complexType>
     </xs:element>