diff --git a/xsd/rss20.xsd b/xsd/rss20.xsd
index 0ddf80957..c80e4de08 100644
--- a/xsd/rss20.xsd
+++ b/xsd/rss20.xsd
@@ -124,7 +124,7 @@
 	</xs:simpleType>
 	<xs:simpleType name="rfc822Type">
 		<xs:restriction base="xs:string">
-			<xs:pattern value="(((Mon)|(Tue)|(Wed)|(Thu)|(Fri)|(Sat)|(Sun)), *)?\d\d? +((Jan)|(Feb)|(Mar)|(Apr)|(May)|(Jun)|(Jul)|(Aug)|(Sep)|(Oct)|(Nov)|(Dec)) +\d\d(\d\d)? +\d\d:\d\d(:\d\d)? +(([+\-]?\d\d\d\d)|(UT)|(GMT)|(EST)|(EDT)|(CST)|(CDT)|(MST)|(MDT)|(PST)|(PDT)|\w)"/>
+			<xs:pattern value="(((Mon)|(Tue)|(Wed)|(Thu)|(Fri)|(Sat)|(Sun)), *)?\d\d? +((Jan)|(Feb)|(Mar)|(Apr)|(May)|(Jun)|(Jul)|(Aug)|(Sep)|(Oct)|(Nov)|(Dec)) +\d\d(\d\d)? +\d\d:\d\d(:\d\d)? +(([+\-]?\d\d\d\d)|(UT)|(UTC)|(GMT)|(EST)|(EDT)|(CST)|(CDT)|(MEZ)|(MESZ)|(MST)|(MDT)|(PST)|(PDT)|\w)"/>
 		</xs:restriction>
 	</xs:simpleType>
 	<xs:complexType name="categoryType">