diff --git a/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php b/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php
index c901bd190..920e54e67 100644
--- a/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php
+++ b/src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php
@@ -13,6 +13,7 @@
 namespace Composer\DependencyResolver\Operation;
 
 use Composer\Package\AliasPackage;
+use Composer\Package\PackageInterface;
 
 /**
  * Solver install operation.
diff --git a/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php b/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php
index 56f7ac19b..77f3aef8c 100644
--- a/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php
+++ b/src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php
@@ -13,6 +13,7 @@
 namespace Composer\DependencyResolver\Operation;
 
 use Composer\Package\AliasPackage;
+use Composer\Package\PackageInterface;
 
 /**
  * Solver install operation.
diff --git a/src/Composer/EventDispatcher/EventDispatcher.php b/src/Composer/EventDispatcher/EventDispatcher.php
index 3bb1c8496..84fdb0db5 100644
--- a/src/Composer/EventDispatcher/EventDispatcher.php
+++ b/src/Composer/EventDispatcher/EventDispatcher.php
@@ -21,6 +21,7 @@ use Composer\Composer;
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\Repository\CompositeRepository;
 use Composer\Script;
+use Composer\Script\CommandEvent;
 use Composer\Script\PackageEvent;
 use Composer\Util\ProcessExecutor;
 
diff --git a/src/Composer/Installer/InstallerInterface.php b/src/Composer/Installer/InstallerInterface.php
index 469b91ed4..e64dfadd2 100644
--- a/src/Composer/Installer/InstallerInterface.php
+++ b/src/Composer/Installer/InstallerInterface.php
@@ -14,6 +14,7 @@ namespace Composer\Installer;
 
 use Composer\Package\PackageInterface;
 use Composer\Repository\InstalledRepositoryInterface;
+use InvalidArgumentException;
 
 /**
  * Interface for the package installation manager.
diff --git a/src/Composer/Repository/ArtifactRepository.php b/src/Composer/Repository/ArtifactRepository.php
index 2bb518b8f..603d71ddc 100644
--- a/src/Composer/Repository/ArtifactRepository.php
+++ b/src/Composer/Repository/ArtifactRepository.php
@@ -15,6 +15,7 @@ namespace Composer\Repository;
 use Composer\IO\IOInterface;
 use Composer\Json\JsonFile;
 use Composer\Package\Loader\ArrayLoader;
+use Composer\Package\Loader\LoaderInterface;
 
 /**
  * @author Serge Smertin <serg.smertin@gmail.com>
diff --git a/src/Composer/Repository/RepositoryManager.php b/src/Composer/Repository/RepositoryManager.php
index 47c152398..9dd88b176 100644
--- a/src/Composer/Repository/RepositoryManager.php
+++ b/src/Composer/Repository/RepositoryManager.php
@@ -15,6 +15,7 @@ namespace Composer\Repository;
 use Composer\IO\IOInterface;
 use Composer\Config;
 use Composer\EventDispatcher\EventDispatcher;
+use Composer\Package\PackageInterface;
 
 /**
  * Repositories manager.