diff --git a/oxtimelines/ffmpeg.py b/oxtimelines/ffmpeg.py
index bf3007f..2b35d12 100644
--- a/oxtimelines/ffmpeg.py
+++ b/oxtimelines/ffmpeg.py
@@ -165,7 +165,7 @@ def audio(path, info=None, samplerate=48000, framerate=FPS):
         else:
             first = False
             audio = np.fromstring(data, dtype="int16")
-            audio = audio.reshape((len(audio)/channels,channels)).astype(dtype='float')
+            audio = audio.reshape((len(audio)/channels,channels)).astype('float')
             yield audio
 
 def rms(x, axis=None):