diff --git a/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormat.java b/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormat.java
index 6582cdd1f0..626210f250 100644
--- a/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormat.java
+++ b/src/main/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormat.java
@@ -29,7 +29,7 @@
 public class NativeEngines990KnnVectorsFormat extends KnnVectorsFormat {
     /** The format for storing, reading, merging vectors on disk */
     private static FlatVectorsFormat flatVectorsFormat;
-    private static final String FORMAT_NAME = "NativeEngines99KnnVectorsFormat";
+    private static final String FORMAT_NAME = "NativeEngines990KnnVectorsFormat";
 
     public NativeEngines990KnnVectorsFormat() {
         super(FORMAT_NAME);
diff --git a/src/test/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormatTests.java b/src/test/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormatTests.java
index 7bf17ec54c..f4f02ba918 100644
--- a/src/test/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormatTests.java
+++ b/src/test/java/org/opensearch/knn/index/codec/KNN990Codec/NativeEngines990KnnVectorsFormatTests.java
@@ -14,6 +14,7 @@
 import lombok.SneakyThrows;
 import lombok.extern.log4j.Log4j2;
 import org.apache.lucene.codecs.Codec;
+import org.apache.lucene.codecs.hnsw.FlatVectorScorerUtil;
 import org.apache.lucene.codecs.hnsw.FlatVectorsReader;
 import org.apache.lucene.codecs.hnsw.FlatVectorsWriter;
 import org.apache.lucene.codecs.lucene99.Lucene99FlatVectorsFormat;
@@ -226,6 +227,16 @@ public void testNativeEngineVectorFormat_whenBinaryQuantizationApplied_thenSucce
         indexReader.close();
     }
 
+    public void testFormatName_withValidInput_thenSuccess() {
+        final String validFormatName = "NativeEngines990KnnVectorsFormat";
+        Assert.assertEquals(validFormatName, new NativeEngines990KnnVectorsFormat().getName());
+        Assert.assertEquals(
+            validFormatName,
+            new NativeEngines990KnnVectorsFormat(new Lucene99FlatVectorsFormat(FlatVectorScorerUtil.getLucene99FlatVectorsScorer()))
+                .getName()
+        );
+    }
+
     private List<String> getFilesFromSegment(Directory dir, String fileFormat) throws IOException {
         return Arrays.stream(dir.listAll()).filter(x -> x.contains(fileFormat)).collect(Collectors.toList());
     }