diff --git a/.gitignore b/.gitignore
index 31103621c..bc959c533 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,3 @@
-/build
 /composer.lock
-/ext/twig/autom4te.cache/
 /phpunit.xml
 /vendor
diff --git a/.travis.yml b/.travis.yml
index 1c1148ffe..98a9fe682 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,11 +12,8 @@ matrix:
         - php: hhvm-stable
           sudo: required
           dist: trusty
-          env: TWIG_EXT=no
         - php: 7.0
-          env: TWIG_EXT=no
         - php: 7.1
-          env: TWIG_EXT=no
     allow_failures:
         - php: hhvm-stable
     fast_finish: true
@@ -27,7 +24,3 @@ before_install:
 
 install:
     - travis_retry composer install
-
-before_script:
-    - if [ "$TWIG_EXT" == "yes" ]; then sh -c "cd ext/twig && phpize && ./configure --enable-twig && make && make install"; fi
-    - if [ "$TWIG_EXT" == "yes" ]; then echo "extension=twig.so" >> `php --ini | grep "Loaded Configuration" | sed -e "s|.*:\s*||"`; fi
diff --git a/CHANGELOG b/CHANGELOG
index 3fa874d9b..fca047a52 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,6 @@
 * 2.0.0 (2016-XX-XX)
 
+ * removed the C extension
  * moved Twig_Environment::getAttribute() to twig_get_attribute()
  * removed Twig_Environment::getLexer(), Twig_Environment::getParser(), Twig_Environment::getCompiler()
  * removed Twig_Compiler::getFilename()
diff --git a/doc/installation.rst b/doc/installation.rst
index 5cf56dbb5..430042bd4 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -30,60 +30,5 @@ Installing the development version
 
     git clone git://github.com/twigphp/Twig.git
 
-Installing the C extension
---------------------------
-
-.. note::
-
-    The C extension is **optional** but it brings some nice performance
-    improvements. Note that the extension is not a replacement for the PHP
-    code; it only implements a small part of the PHP code to improve the
-    performance at runtime; you must still install the regular PHP code.
-
-Twig comes with a C extension that enhances the performance of the Twig
-runtime engine; install it like any other PHP extensions:
-
-.. code-block:: bash
-
-    cd ext/twig
-    phpize
-    ./configure
-    make
-    make install
-
-For Windows:
-
-1. Setup the build environment following the `PHP documentation`_
-2. Put Twig's C extension source code into ``C:\php-sdk\phpdev\vcXX\x86\php-source-directory\ext\twig``
-3. Use the ``configure --disable-all --enable-cli --enable-twig=shared`` command instead of step 14
-4. ``nmake``
-5. Copy the ``C:\php-sdk\phpdev\vcXX\x86\php-source-directory\Release_TS\php_twig.dll`` file to your PHP setup.
-
-.. tip::
-
-    For Windows ZendServer, ZTS is not enabled as mentioned in `Zend Server
-    FAQ`_.
-
-    You have to use ``configure --disable-all --disable-zts --enable-cli
-    --enable-twig=shared`` to be able to build the twig C extension for
-    ZendServer.
-
-    The built DLL will be available in
-    ``C:\\php-sdk\\phpdev\\vcXX\\x86\\php-source-directory\\Release``
-
-Finally, enable the extension in your ``php.ini`` configuration file:
-
-.. code-block:: ini
-
-    extension=twig.so #For Unix systems
-    extension=php_twig.dll #For Windows systems
-
-And from now on, Twig will automatically compile your templates to take
-advantage of the C extension. Note that this extension does not replace the
-PHP code but only provides an optimized version of the
-``Twig_Template::getAttribute()`` method.
-
-.. _`download page`:     https://github.com/twigphp/Twig/tags
-.. _`Composer`:          https://getcomposer.org/download/
-.. _`PHP documentation`: https://wiki.php.net/internals/windows/stepbystepbuild
-.. _`Zend Server FAQ`:   http://www.zend.com/en/products/server/faq#faqD6
+.. _`download page`: https://github.com/twigphp/Twig/tags
+.. _`Composer`:      https://getcomposer.org/download/