diff --git a/src/Symfony/Component/Console/Output/NullOutput.php b/src/Symfony/Component/Console/Output/NullOutput.php
index 301b7f5f6a..c75cfcae98 100644
--- a/src/Symfony/Component/Console/Output/NullOutput.php
+++ b/src/Symfony/Component/Console/Output/NullOutput.php
@@ -78,7 +78,7 @@ class NullOutput implements OutputInterface
     /**
      * {@inheritdoc}
      */
-    public function writeln($messages, $type = 0)
+    public function writeln($messages, $type = self::OUTPUT_NORMAL)
     {
         // do nothing
     }
@@ -86,7 +86,7 @@ class NullOutput implements OutputInterface
     /**
      * {@inheritdoc}
      */
-    public function write($messages, $newline = false, $type = 0)
+    public function write($messages, $newline = false, $type = self::OUTPUT_NORMAL)
     {
         // do nothing
     }
diff --git a/src/Symfony/Component/Console/Output/Output.php b/src/Symfony/Component/Console/Output/Output.php
index 2493ae66e6..ec0290e378 100644
--- a/src/Symfony/Component/Console/Output/Output.php
+++ b/src/Symfony/Component/Console/Output/Output.php
@@ -128,7 +128,7 @@ abstract class Output implements OutputInterface
      *
      * @api
      */
-    public function writeln($messages, $type = 0)
+    public function writeln($messages, $type = self::OUTPUT_NORMAL)
     {
         $this->write($messages, true, $type);
     }
@@ -144,7 +144,7 @@ abstract class Output implements OutputInterface
      *
      * @api
      */
-    public function write($messages, $newline = false, $type = 0)
+    public function write($messages, $newline = false, $type = self::OUTPUT_NORMAL)
     {
         if (self::VERBOSITY_QUIET === $this->verbosity) {
             return;
diff --git a/src/Symfony/Component/Console/Output/OutputInterface.php b/src/Symfony/Component/Console/Output/OutputInterface.php
index 4d7606cb53..eab9d54e14 100644
--- a/src/Symfony/Component/Console/Output/OutputInterface.php
+++ b/src/Symfony/Component/Console/Output/OutputInterface.php
@@ -43,7 +43,7 @@ interface OutputInterface
      *
      * @api
      */
-    public function write($messages, $newline = false, $type = 0);
+    public function write($messages, $newline = false, $type = self::OUTPUT_NORMAL);
 
     /**
      * Writes a message to the output and adds a newline at the end.
@@ -53,7 +53,7 @@ interface OutputInterface
      *
      * @api
      */
-    public function writeln($messages, $type = 0);
+    public function writeln($messages, $type = self::OUTPUT_NORMAL);
 
     /**
      * Sets the verbosity of the output.