diff --git a/build/build.xml b/build/build.xml
index 2e65539035..4e54de5f87 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -436,6 +436,15 @@
 		<delete file="${dir}/vendor/symfony/twig-bridge/Symfony/Bridge/Twig/CHANGELOG.md" />
 		<delete file="${dir}/vendor/symfony/twig-bridge/Symfony/Bridge/Twig/README.md" />
 		<delete file="${dir}/vendor/symfony/twig-bridge/Symfony/Bridge/Twig/phpunit.xml.dist" />
+
+        <delete dir="${dir}/vendor/marc1706/fast-image-size/tests" />
+        <delete dir="${dir}/vendor/marc1706/fast-image-size/travis" />
+        <delete dir="${dir}/vendor/marc1706/fast-image-size/.git" />
+        <delete file="${dir}/vendor/marc1706/fast-image-size/.gitignore" />
+        <delete file="${dir}/vendor/marc1706/fast-image-size/.travis.yml" />
+        <delete file="${dir}/vendor/marc1706/fast-image-size/composer.phar" />
+        <delete file="${dir}/vendor/marc1706/fast-image-size/phpunit.xml.dist" />
+        <delete file="${dir}/vendor/marc1706/fast-image-size/README.md" />
 	</target>
 
 	<target name="clean-diff-dir">