diff --git a/lucene/codecs/src/test/org/apache/lucene/codecs/simpletext/TestSimpleTextKnnVectorsFormat.java b/lucene/codecs/src/test/org/apache/lucene/codecs/simpletext/TestSimpleTextKnnVectorsFormat.java
index 873e22990aa..83ca2eddd39 100644
--- a/lucene/codecs/src/test/org/apache/lucene/codecs/simpletext/TestSimpleTextKnnVectorsFormat.java
+++ b/lucene/codecs/src/test/org/apache/lucene/codecs/simpletext/TestSimpleTextKnnVectorsFormat.java
@@ -20,6 +20,7 @@ import org.apache.lucene.codecs.Codec;
 import org.apache.lucene.document.Document;
 import org.apache.lucene.document.KnnVectorField;
 import org.apache.lucene.index.IndexWriter;
+import org.apache.lucene.index.VectorEncoding;
 import org.apache.lucene.index.VectorSimilarityFunction;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.tests.index.BaseKnnVectorsFormatTestCase;
@@ -30,6 +31,12 @@ public class TestSimpleTextKnnVectorsFormat extends BaseKnnVectorsFormatTestCase
     return new SimpleTextCodec();
   }
 
+  @Override
+  protected VectorEncoding randomVectorEncoding() {
+    // TODO: Should SimpleTextKnnVectorsFormat support all encodings?
+    return VectorEncoding.FLOAT32;
+  }
+
   public void testUnsupportedEncoding() throws Exception {
     try (Directory dir = newDirectory();
         IndexWriter iw = new IndexWriter(dir, newIndexWriterConfig())) {