diff --git a/lucene/analysis/nori/src/tools/java/org/apache/lucene/analysis/ko/util/UnknownDictionaryBuilder.java b/lucene/analysis/nori/src/tools/java/org/apache/lucene/analysis/ko/util/UnknownDictionaryBuilder.java
index adfa91541f8..a4088664ce3 100644
--- a/lucene/analysis/nori/src/tools/java/org/apache/lucene/analysis/ko/util/UnknownDictionaryBuilder.java
+++ b/lucene/analysis/nori/src/tools/java/org/apache/lucene/analysis/ko/util/UnknownDictionaryBuilder.java
@@ -32,7 +32,7 @@ import java.util.List;
 import org.apache.lucene.analysis.ko.dict.CharacterDefinition;
 
 public class UnknownDictionaryBuilder {
-  private static final String NGRAM_DICTIONARY_ENTRY = "NGRAM,1798,3559,3677,UNKNOWN,*,*,*,*,*,*,*";
+  private static final String NGRAM_DICTIONARY_ENTRY = "NGRAM,1798,3559,3677,SY,*,*,*,*,*,*,*";
   
   private String encoding = "utf-8";