diff --git a/README.md b/README.md
index 79c07d7..79259d4 100644
--- a/README.md
+++ b/README.md
@@ -165,7 +165,7 @@ documentation below for more information.
 The ouput file MUST use the PNG extension.
 
 ```php
-$waveform = $audio->waveform(640, 120, ['#00FF00']);
+$waveform = $audio->waveform(640, 120, array('#00FF00'));
 $waveform->save('waveform.png');
 ```
 
diff --git a/src/FFMpeg/Media/Audio.php b/src/FFMpeg/Media/Audio.php
index 71fad6b..c8fddb4 100644
--- a/src/FFMpeg/Media/Audio.php
+++ b/src/FFMpeg/Media/Audio.php
@@ -135,7 +135,7 @@ class Audio extends AbstractStreamableMedia
      * @param array $colors Array of colors for ffmpeg to use. Color format is #000000 (RGB hex string with #)
      * @return Waveform
      */
-    public function waveform($width = 640, $height = 120, $colors = [Waveform::DEFAULT_COLOR])
+    public function waveform($width = 640, $height = 120, $colors = array(Waveform::DEFAULT_COLOR))
     {
         return new Waveform($this, $this->driver, $this->ffprobe, $width, $height, $colors);
     }
diff --git a/src/FFMpeg/Media/Waveform.php b/src/FFMpeg/Media/Waveform.php
index 975f542..94f1907 100644
--- a/src/FFMpeg/Media/Waveform.php
+++ b/src/FFMpeg/Media/Waveform.php
@@ -33,7 +33,7 @@ class Waveform extends AbstractMediaType
      */
     protected $colors;
 
-    public function __construct(Audio $audio, FFMpegDriver $driver, FFProbe $ffprobe, $width, $height, $colors = [self::DEFAULT_COLOR])
+    public function __construct(Audio $audio, FFMpegDriver $driver, FFProbe $ffprobe, $width, $height, $colors = array(self::DEFAULT_COLOR))
     {
         parent::__construct($audio->getPathfile(), $driver, $ffprobe);
         $this->audio = $audio;