diff --git a/google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/JsonToProtoMessage.java b/google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/JsonToProtoMessage.java
index c9ec09fdab..7785c818cd 100644
--- a/google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/JsonToProtoMessage.java
+++ b/google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/JsonToProtoMessage.java
@@ -441,9 +441,6 @@ private static void fillRepeatedField(
                             + index
                             + "] could not be converted to byte[]."));
               }
-            } else if (val instanceof ByteString) {
-              protoMsg.addRepeatedField(fieldDescriptor, ((ByteString) val).toByteArray());
-              return;
             } else {
               fail = true;
             }
diff --git a/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/it/ITBigQueryWriteManualClientTest.java b/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/it/ITBigQueryWriteManualClientTest.java
index 796e1acb29..4f9b7a7da6 100644
--- a/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/it/ITBigQueryWriteManualClientTest.java
+++ b/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/it/ITBigQueryWriteManualClientTest.java
@@ -29,6 +29,7 @@
 import com.google.cloud.bigquery.storage.v1.*;
 import com.google.cloud.bigquery.testing.RemoteBigQueryHelper;
 import com.google.common.collect.ImmutableList;
+import com.google.protobuf.ByteString;
 import com.google.protobuf.Descriptors;
 import com.google.protobuf.Descriptors.DescriptorValidationException;
 import java.io.IOException;
@@ -327,11 +328,18 @@ public void testJsonStreamWriterWithDefaultStream()
             .setMode(TableFieldSchema.Mode.NULLABLE)
             .setName("test_datetime")
             .build();
+    TableFieldSchema TEST_REPEATED_BYTESTRING =
+        TableFieldSchema.newBuilder()
+            .setType(TableFieldSchema.Type.BYTES)
+            .setMode(TableFieldSchema.Mode.REPEATED)
+            .setName("test_bytestring_repeated")
+            .build();
     TableSchema tableSchema =
         TableSchema.newBuilder()
             .addFields(0, TEST_STRING)
             .addFields(1, TEST_DATE)
             .addFields(2, TEST_NUMERIC)
+            .addFields(3, TEST_REPEATED_BYTESTRING)
             .build();
     TableInfo tableInfo =
         TableInfo.newBuilder(
@@ -347,8 +355,13 @@ public void testJsonStreamWriterWithDefaultStream()
                             .build(),
                         com.google.cloud.bigquery.Field.newBuilder(
                                 "test_datetime", StandardSQLTypeName.DATETIME)
+                            .build(),
+                        com.google.cloud.bigquery.Field.newBuilder(
+                                "test_bytestring_repeated", StandardSQLTypeName.BYTES)
+                            .setMode(Field.Mode.REPEATED)
                             .build())))
             .build();
+
     bigquery.create(tableInfo);
     TableName parent = TableName.of(ServiceOptions.getDefaultProjectId(), DATASET, tableName);
     try (JsonStreamWriter jsonStreamWriter =
@@ -371,6 +384,13 @@ public void testJsonStreamWriterWithDefaultStream()
       row1.put(
           "test_datetime",
           CivilTimeEncoder.encodePacked64DatetimeMicros(LocalDateTime.of(2020, 10, 1, 12, 0)));
+      row1.put(
+          "test_bytestring_repeated",
+          new JSONArray(
+              new byte[][] {
+                ByteString.copyFromUtf8("a").toByteArray(),
+                ByteString.copyFromUtf8("b").toByteArray()
+              }));
       JSONArray jsonArr1 = new JSONArray(new JSONObject[] {row1});
 
       ApiFuture<AppendRowsResponse> response1 = jsonStreamWriter.append(jsonArr1, -1);
@@ -405,6 +425,8 @@ public void testJsonStreamWriterWithDefaultStream()
       assertEquals("aaa", currentRow.get(0).getStringValue());
       assertEquals("-9000000", currentRow.get(1).getRepeatedValue().get(1).getStringValue());
       assertEquals("2020-10-01T12:00:00", currentRow.get(2).getStringValue());
+      assertEquals(2, currentRow.get(3).getRepeatedValue().size());
+      assertEquals("Yg==", currentRow.get(3).getRepeatedValue().get(1).getStringValue());
       assertEquals("bbb", iter.next().get(0).getStringValue());
       assertEquals("ccc", iter.next().get(0).getStringValue());
       assertEquals("ddd", iter.next().get(0).getStringValue());