diff --git a/aircox/models/sound.py b/aircox/models/sound.py
index d1e655b..ede35f1 100644
--- a/aircox/models/sound.py
+++ b/aircox/models/sound.py
@@ -103,7 +103,7 @@ class Sound(models.Model):
         return os.path.join(self.program.path, subdir, filename)
 
     file = models.FileField(
-        _('file'), upload_to=_upload_to
+        _('file'), upload_to=_upload_to, max_length=256,
     )
     duration = models.TimeField(
         _('duration'),