Index: wp-includes/class-wp-image-editor-imagick.php
===================================================================
--- wp-includes/class-wp-image-editor-imagick.php	(revision 22831)
+++ wp-includes/class-wp-image-editor-imagick.php	(working copy)
@@ -38,9 +38,12 @@
 	 * @return boolean
 	 */
 	public static function test( $args = array() ) {
-		if ( ! extension_loaded( 'imagick' ) || ! is_callable( 'Imagick', 'queryFormats' ) )
+		if ( ! extension_loaded( 'imagick' ) || ! class_exists( 'Imagick' ) || ! is_callable( 'Imagick', 'queryFormats' ) )
 			return false;
 
+		if( ( ! isset( $args['mime_type'] ) || $args['mime_type'] == 'image/gif' )  && ! is_callable( $this->image, 'setIteratorIndex' ) )
+			return false;
+
 		return true;
 	}