diff --git a/org.springframework.oxm/src/main/resources/org/springframework/oxm/config/spring-oxm-3.0.xsd b/org.springframework.oxm/src/main/resources/org/springframework/oxm/config/spring-oxm-3.0.xsd
index bf64758b58..2d7d0d2a75 100644
--- a/org.springframework.oxm/src/main/resources/org/springframework/oxm/config/spring-oxm-3.0.xsd
+++ b/org.springframework.oxm/src/main/resources/org/springframework/oxm/config/spring-oxm-3.0.xsd
@@ -108,6 +108,7 @@
             <xsd:appinfo>
                 <tool:annotation kind="direct">
                     <tool:expected-type type="java.lang.Class"/>
+					<tool:assignable-to restriction="class-only" />
                 </tool:annotation>
             </xsd:appinfo>
         </xsd:annotation>