diff --git a/src/main/org/apache/tools/ant/types/XMLCatalog.java b/src/main/org/apache/tools/ant/types/XMLCatalog.java
index 09dea5311..b967a8862 100644
--- a/src/main/org/apache/tools/ant/types/XMLCatalog.java
+++ b/src/main/org/apache/tools/ant/types/XMLCatalog.java
@@ -789,6 +789,8 @@ public class XMLCatalog extends DataType
      * the ExternalResolver strategy.
      */
     private interface CatalogResolver extends URIResolver, EntityResolver {
+        @Override
+        InputSource resolveEntity(String publicId, String systemId);
     }
 
     /**