diff --git a/lucene/core/src/java/org/apache/lucene/index/LegacySortedNumericDocValuesWrapper.java b/lucene/core/src/java/org/apache/lucene/index/LegacySortedNumericDocValuesWrapper.java
index cfb61e3c2d1..a75274e999e 100644
--- a/lucene/core/src/java/org/apache/lucene/index/LegacySortedNumericDocValuesWrapper.java
+++ b/lucene/core/src/java/org/apache/lucene/index/LegacySortedNumericDocValuesWrapper.java
@@ -77,6 +77,7 @@ public final class LegacySortedNumericDocValuesWrapper extends SortedNumericDocV
   public boolean advanceExact(int target) throws IOException {
     docID = target;
     values.setDocument(docID);
+    upto = 0;
     return values.count() != 0;
   }