diff --git a/lucene/codecs/src/java/org/apache/lucene/codecs/simpletext/SimpleTextKnnVectorsReader.java b/lucene/codecs/src/java/org/apache/lucene/codecs/simpletext/SimpleTextKnnVectorsReader.java
index 97a518701b0..0a8c4836321 100644
--- a/lucene/codecs/src/java/org/apache/lucene/codecs/simpletext/SimpleTextKnnVectorsReader.java
+++ b/lucene/codecs/src/java/org/apache/lucene/codecs/simpletext/SimpleTextKnnVectorsReader.java
@@ -434,6 +434,11 @@ public class SimpleTextKnnVectorsReader extends KnnVectorsReader {
       return binaryValue.bytes;
     }
 
+    @Override
+    public int ordToDoc(int ord) {
+      return entry.ordToDoc[ord];
+    }
+
     @Override
     public DocIndexIterator iterator() {
       return createSparseIterator();