diff --git a/src/Symfony/Component/Debug/Debug.php b/src/Symfony/Component/Debug/Debug.php
index f8d2beaa065ba..e26810cb1ed8d 100644
--- a/src/Symfony/Component/Debug/Debug.php
+++ b/src/Symfony/Component/Debug/Debug.php
@@ -31,7 +31,7 @@ class Debug
      * @param int  $errorReportingLevel The level of error reporting you want
      * @param bool $displayErrors       Whether to display errors (for development) or just log them (for production)
      */
-    public static function enable($errorReportingLevel = null, $displayErrors = true)
+    public static function enable($errorReportingLevel = E_ALL, $displayErrors = true)
     {
         if (static::$enabled) {
             return;
@@ -42,7 +42,7 @@ public static function enable($errorReportingLevel = null, $displayErrors = true
         if (null !== $errorReportingLevel) {
             error_reporting($errorReportingLevel);
         } else {
-            error_reporting(-1);
+            error_reporting(E_ALL);
         }
 
         if ('cli' !== php_sapi_name()) {
diff --git a/src/Symfony/Component/Debug/ErrorHandler.php b/src/Symfony/Component/Debug/ErrorHandler.php
index 5f31aa4df618b..0725687c7b6c8 100644
--- a/src/Symfony/Component/Debug/ErrorHandler.php
+++ b/src/Symfony/Component/Debug/ErrorHandler.php
@@ -113,8 +113,6 @@ public static function register(self $handler = null, $replace = true)
             register_shutdown_function(__CLASS__.'::handleFatalError');
         }
 
-        $levels = -1;
-
         if ($handlerIsNew = null === $handler) {
             $handler = new static();
         }
@@ -131,7 +129,7 @@ public static function register(self $handler = null, $replace = true)
             restore_error_handler();
         }
 
-        $handler->throwAt($levels & $handler->thrownErrors, true);
+        $handler->throwAt(E_ALL & $handler->thrownErrors, true);
 
         return $handler;
     }
@@ -151,7 +149,7 @@ public function __construct(BufferingLogger $bootstrappingLogger = null)
      * @param array|int       $levels  An array map of E_* to LogLevel::* or an integer bit field of E_* constants
      * @param bool            $replace Whether to replace or not any existing logger
      */
-    public function setDefaultLogger(LoggerInterface $logger, $levels = null, $replace = false)
+    public function setDefaultLogger(LoggerInterface $logger, $levels = E_ALL, $replace = false)
     {
         $loggers = array();
 
@@ -163,7 +161,7 @@ public function setDefaultLogger(LoggerInterface $logger, $levels = null, $repla
             }
         } else {
             if (null === $levels) {
-                $levels = E_ALL | E_STRICT;
+                $levels = E_ALL;
             }
             foreach ($this->loggers as $type => $log) {
                 if (($type & $levels) && (empty($log[0]) || $replace || $log[0] === $this->bootstrappingLogger)) {
@@ -255,7 +253,7 @@ public function setExceptionHandler(callable $handler = null)
     public function throwAt($levels, $replace = false)
     {
         $prev = $this->thrownErrors;
-        $this->thrownErrors = (E_ALL | E_STRICT) & ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED;
+        $this->thrownErrors = E_ALL & ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED;
         if (!$replace) {
             $this->thrownErrors |= $prev;
         }
diff --git a/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php b/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
index 9a15e878a65e4..7b5e2b501f45d 100644
--- a/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
+++ b/src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php
@@ -26,7 +26,7 @@ class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
 
     protected function setUp()
     {
-        $this->errorReporting = error_reporting(E_ALL | E_STRICT);
+        $this->errorReporting = error_reporting(E_ALL);
         $this->loader = new ClassLoader();
         spl_autoload_register(array($this->loader, 'loadClass'), true, true);
         DebugClassLoader::enable();
diff --git a/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php b/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php
index 33a543819d08d..878e349db78b8 100644
--- a/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php
+++ b/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php
@@ -45,12 +45,12 @@ class DebugHandlersListener implements EventSubscriberInterface
      * @param bool                 $scream           Enables/disables screaming mode, where even silenced errors are logged
      * @param string               $fileLinkFormat   The format for links to source files
      */
-    public function __construct(callable $exceptionHandler = null, LoggerInterface $logger = null, $levels = null, $throwAt = -1, $scream = true, $fileLinkFormat = null)
+    public function __construct(callable $exceptionHandler = null, LoggerInterface $logger = null, $levels = E_ALL, $throwAt = E_ALL, $scream = true, $fileLinkFormat = null)
     {
         $this->exceptionHandler = $exceptionHandler;
         $this->logger = $logger;
-        $this->levels = $levels;
-        $this->throwAt = is_numeric($throwAt) ? (int) $throwAt : (null === $throwAt ? null : ($throwAt ? -1 : null));
+        $this->levels = null === $levels ? E_ALL : $levels;
+        $this->throwAt = is_numeric($throwAt) ? (int) $throwAt : (null === $throwAt ? null : ($throwAt ? E_ALL : null));
         $this->scream = (bool) $scream;
         $this->fileLinkFormat = $fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
     }
@@ -79,7 +79,7 @@ public function configure(Event $event = null)
                             $scream |= $type;
                         }
                     } else {
-                        $scream = null === $this->levels ? E_ALL | E_STRICT : $this->levels;
+                        $scream = $this->levels;
                     }
                     if ($this->scream) {
                         $handler->screamAt($scream);