diff --git a/src/Composer/Installer/PackageEvent.php b/src/Composer/Installer/PackageEvent.php
index 881820c91..0be86a77c 100644
--- a/src/Composer/Installer/PackageEvent.php
+++ b/src/Composer/Installer/PackageEvent.php
@@ -70,7 +70,7 @@ class PackageEvent extends Event
      * @param OperationInterface[] $operations
      * @param OperationInterface   $operation
      */
-    public function __construct($eventName, Composer $composer, IOInterface $io, $devMode, RepositoryInterface $localRepo, array $operations = array(), OperationInterface $operation)
+    public function __construct($eventName, Composer $composer, IOInterface $io, $devMode, RepositoryInterface $localRepo, array $operations, OperationInterface $operation)
     {
         parent::__construct($eventName);
 
diff --git a/src/Composer/Repository/ComposerRepository.php b/src/Composer/Repository/ComposerRepository.php
index e9131839c..21d16f9a9 100644
--- a/src/Composer/Repository/ComposerRepository.php
+++ b/src/Composer/Repository/ComposerRepository.php
@@ -742,7 +742,7 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
      * @param string $name package name (must be lowercased already)
      * @private
      */
-    public function isVersionAcceptable(array $acceptableStabilities = null, array $stabilityFlags = null, $constraint = null, $name, $versionData)
+    public function isVersionAcceptable(array $acceptableStabilities, array $stabilityFlags, $constraint, $name, $versionData)
     {
         $versions = array($versionData['version_normalized']);