diff --git a/src/Composer/Plugin/PluginManager.php b/src/Composer/Plugin/PluginManager.php
index 666bbce2a..fcc170223 100644
--- a/src/Composer/Plugin/PluginManager.php
+++ b/src/Composer/Plugin/PluginManager.php
@@ -190,7 +190,8 @@ class PluginManager
                 $code = str_replace('__FILE__', var_export($path, true), $code);
                 $code = str_replace('__DIR__', var_export(dirname($path), true), $code);
                 $code = str_replace('__CLASS__', var_export($class, true), $code);
-                eval('?>'.$code);
+                $code = preg_replace('/^\s*<\?(php)?/i', '', $code, 1);
+                eval($code);
                 $class .= '_composer_tmp'.self::$classCounter;
                 self::$classCounter++;
             }
diff --git a/tests/Composer/Test/Plugin/Fixtures/plugin-v9/Installer/Plugin.php b/tests/Composer/Test/Plugin/Fixtures/plugin-v9/Installer/Plugin.php
new file mode 100644
index 000000000..74e1beb8b
--- /dev/null
+++ b/tests/Composer/Test/Plugin/Fixtures/plugin-v9/Installer/Plugin.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Installer;
+
+use Composer\Composer;
+use Composer\IO\IOInterface;
+use Composer\Plugin\PluginInterface;
+
+class Plugin implements PluginInterface
+{
+    public $version = 'installer-v9';
+
+    public function activate(Composer $composer, IOInterface $io)
+    {
+    }
+}
diff --git a/tests/Composer/Test/Plugin/Fixtures/plugin-v9/composer.json b/tests/Composer/Test/Plugin/Fixtures/plugin-v9/composer.json
new file mode 100644
index 000000000..f3ccb9397
--- /dev/null
+++ b/tests/Composer/Test/Plugin/Fixtures/plugin-v9/composer.json
@@ -0,0 +1,12 @@
+{
+    "name": "plugin-v9",
+    "version": "9.0.0",
+    "type": "composer-plugin",
+    "autoload": { "psr-0": { "Installer": "" } },
+    "extra": {
+        "class": "Installer\\Plugin"
+    },
+    "require": {
+        "composer-plugin-api": "^1.0"
+    }
+}