diff --git a/tests/phpunit/tests/dbdelta.php b/tests/phpunit/tests/dbdelta.php
index ecf7c8a294..ecd92ddca3 100644
--- a/tests/phpunit/tests/dbdelta.php
+++ b/tests/phpunit/tests/dbdelta.php
@@ -363,7 +363,7 @@ class Tests_dbDelta extends WP_UnitTestCase {
 
 		$table_name = 'test_truncated_index';
 
-		$create = "CREATE TABLE $table_name (\n a varchar(255) COLLATE utf8mb4_unicode_ci,\n KEY a (a)\n)";
+		$create = "CREATE TABLE $table_name (\n a varchar(255) COLLATE utf8mb4_unicode_ci,\n KEY a (a)\n) ROW_FORMAT=DYNAMIC";
 		$wpdb->query( $create );
 
 		$actual = dbDelta( $create, false );