diff --git a/core/src/main/resources/struts-2.0.dtd b/core/src/main/resources/struts-2.0.dtd
index 566752965..b7f0e42dd 100644
--- a/core/src/main/resources/struts-2.0.dtd
+++ b/core/src/main/resources/struts-2.0.dtd
@@ -39,7 +39,7 @@
     class CDATA #REQUIRED
 >
 
-<!ELEMENT interceptor-stack (interceptor-ref+)>
+<!ELEMENT interceptor-stack (interceptor-ref*)>
 <!ATTLIST interceptor-stack
     name CDATA #REQUIRED
 >