Index: src/java/com/thoughtworks/xstream/mapper/FieldAliasingMapper.java
===================================================================
--- src/java/com/thoughtworks/xstream/mapper/FieldAliasingMapper.java	(revision 848)
+++ src/java/com/thoughtworks/xstream/mapper/FieldAliasingMapper.java	(working copy)
@@ -57,8 +57,8 @@
         }
     }
 
-    public boolean shouldSerializeMember(Class definedIn, String fieldName) {
-        return !fieldsToOmit.contains(key(definedIn, fieldName));
+    public boolean shouldSerializeMember(Class definedIn, String fieldName, Class fieldType, Object value) {
+        return fieldsToOmit.contains(key(definedIn, fieldName)) ? false: super.shouldSerializeMember(definedIn, fieldName, fieldType, value);
     }
 
     public void omitField(Class type, String fieldName) {