Index: LuceneDictionary.java
===================================================================
--- LuceneDictionary.java	(revision 409007)
+++ LuceneDictionary.java	(working copy)
@@ -36,7 +36,7 @@
 
   public LuceneDictionary(IndexReader reader, String field) {
     this.reader = reader;
-    this.field = field;
+    this.field = field.intern();
   }
 
   public final Iterator getWordsIterator() {