diff --git a/src/Composer/Installer/PluginInstaller.php b/src/Composer/Installer/PluginInstaller.php
index 68326462e..bae1d938b 100644
--- a/src/Composer/Installer/PluginInstaller.php
+++ b/src/Composer/Installer/PluginInstaller.php
@@ -50,7 +50,7 @@ class PluginInstaller extends LibraryInstaller
     {
         // fail install process early if it is going to fail due to a plugin not being allowed
         if (($type === 'install' || $type === 'update') && !$this->getPluginManager()->arePluginsDisabled('local')) {
-            $this->getPluginManager()->isPluginAllowed($package->getName(), false);
+            $this->getPluginManager()->isPluginAllowed($package->getName(), false, $package->getExtra()['plugin-optional'] ?? false);
         }
 
         return parent::prepare($type, $package, $prevPackage);