diff --git a/org.springframework.integration/src/main/java/org/springframework/integration/config/xml/spring-integration-1.0.xsd b/org.springframework.integration/src/main/java/org/springframework/integration/config/xml/spring-integration-1.0.xsd
index 0225dc0862..223a297e46 100644
--- a/org.springframework.integration/src/main/java/org/springframework/integration/config/xml/spring-integration-1.0.xsd
+++ b/org.springframework.integration/src/main/java/org/springframework/integration/config/xml/spring-integration-1.0.xsd
@@ -435,6 +435,7 @@
 		<xsd:attribute name="correlation-id" type="xsd:string"/>
 		<xsd:attribute name="expiration-date" type="xsd:string"/>
 		<xsd:attribute name="priority" type="xsd:string"/>
+		<xsd:attribute name="overwrite" type="xsd:string"/>
 	</xsd:attributeGroup>
 
 	<xsd:element name="thread-pool-task-executor">