diff --git a/lucene/core/src/java/org/apache/lucene/util/fst/FST.java b/lucene/core/src/java/org/apache/lucene/util/fst/FST.java
index 59a9e394b80..16f8f207f50 100644
--- a/lucene/core/src/java/org/apache/lucene/util/fst/FST.java
+++ b/lucene/core/src/java/org/apache/lucene/util/fst/FST.java
@@ -141,7 +141,6 @@ public final class FST<T> {
 
   // Not private to avoid synthetic access$NNN methods:
   byte[] bytes;
-  int byteUpto = 0;
 
   private int startNode = -1;