diff --git a/moviepy/video/io/ImageSequenceClip.py b/moviepy/video/io/ImageSequenceClip.py
index 86cb17a94..79ff43d29 100644
--- a/moviepy/video/io/ImageSequenceClip.py
+++ b/moviepy/video/io/ImageSequenceClip.py
@@ -75,7 +75,7 @@ def __init__(self, sequence, fps=None, durations=None, with_mask=True,
                         for f in os.listdir(sequence)])
 
         self.fps = fps
-        if fps is not none:
+        if fps is not None:
             durations = [1.0/fps for image in sequence]
         self.durations = durations
         self.images_starts = [0]+list(np.cumsum(durations))