diff --git a/parsecsv.lib.php b/parsecsv.lib.php
index bfcf0c7..902903b 100644
--- a/parsecsv.lib.php
+++ b/parsecsv.lib.php
@@ -1,20 +1,17 @@
 <?php
 
-// This file should not be used at all! It purely exists to reduce the
-// maintenance burden for existing code using this repo.
+// This file should not be used at all! Instead, please use Composer's autoload.
+// It purely exists to reduce the maintenance burden for existing code using
+// this repository.
 
 // Check if people used Composer to include this project in theirs
 if (!file_exists(__DIR__ . '/vendor/autoload.php')) {
-    die(
-        "Please run `composer dump-autoload` to build the autoloader.\n\n" .
-        "Actually, you should consider not including/requiring this file \n" .
-        "  " . __FILE__ . "\n" .
-        "Just run `composer require parsecsv/php-parsecsv` and look at the \n" .
-        "'examples' directory of this repository."
-    );
+    require __DIR__ . '/src/extensions/DatatypeTrait.php';
+    require __DIR__ . '/src/Csv.php';
+} else {
+    require __DIR__ . '/vendor/autoload.php';
 }
 
-require __DIR__ . '/vendor/autoload.php';
 
 // This wrapper class should not be used by new projects. Please look at the
 // examples to find the up-to-date way of using this repo.
diff --git a/src/Csv.php b/src/Csv.php
index 13f165f..ab3361c 100644
--- a/src/Csv.php
+++ b/src/Csv.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace ParseCsv;
 
 use ParseCsv\extensions\DatatypeTrait;
diff --git a/tests/methods/OldRequireTest.php b/tests/methods/OldRequireTest.php
new file mode 100644
index 0000000..6f7adfb
--- /dev/null
+++ b/tests/methods/OldRequireTest.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace ParseCsv\tests\methods;
+
+use PHPUnit\Framework\TestCase;
+
+class OldRequireTest extends TestCase {
+
+    protected function setUp() {
+        rename('vendor/autoload.php', '__autoload');
+    }
+
+    protected function tearDown() {
+        rename('__autoload', 'vendor/autoload.php');
+    }
+
+    /**
+     * @runInSeparateProcess because download.php uses header()
+     */
+    public function testOldLibWithoutComposer() {
+
+        file_put_contents('__eval.php', '<?php require "parsecsv.lib.php"; new \ParseCsv\Csv;');
+        exec("php __eval.php", $output, $return_var);
+        unlink('__eval.php');
+        $this->assertEquals($output, []);
+        $this->assertEquals(0, $return_var);
+    }
+}