diff --git a/.travis.yml b/.travis.yml
index 05a390383..681efa09c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,6 +29,7 @@ matrix:
       env: DB=MYSQL BEHAT_TEST=1
 
 before_script:
+ - printf "\n" | pecl install imagick
  - composer self-update || true
  - phpenv rehash
  - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support
diff --git a/filesystem/GD.php b/filesystem/GD.php
index 623923cec..d34704f56 100644
--- a/filesystem/GD.php
+++ b/filesystem/GD.php
@@ -108,6 +108,7 @@ class GDBackend extends Object implements Image_Backend {
 
 	/**
 	 * @param string $filename
+	 * @param string $manipulation
 	 * @return boolean
 	 */
 	public function imageAvailable($filename, $manipulation) {
diff --git a/filesystem/ImagickBackend.php b/filesystem/ImagickBackend.php
index 3112d8b10..8f302cb24 100644
--- a/filesystem/ImagickBackend.php
+++ b/filesystem/ImagickBackend.php
@@ -99,9 +99,10 @@ class ImagickBackend extends Imagick implements Image_Backend {
 	 * @todo Implement memory checking for Imagick? See {@link GD}
 	 *
 	 * @param string $filename
+	 * @param string $manipulation
 	 * @return boolean
 	 */
-	public function imageAvailable($filename) {
+	public function imageAvailable($filename, $manipulation) {
 		return true;
 	}
 
diff --git a/model/Image_Backend.php b/model/Image_Backend.php
index 919a916f2..131252c77 100644
--- a/model/Image_Backend.php
+++ b/model/Image_Backend.php
@@ -115,6 +115,7 @@ interface Image_Backend {
 	 * imageAvailable
 	 *
 	 * @param string $filename
+	 * @param string $manipulation
 	 * @return boolean
 	 */
 	public function imageAvailable($filename, $manipulation);