diff --git a/spa/signals.py b/spa/signals.py
index 5c65bba..4030307 100755
--- a/spa/signals.py
+++ b/spa/signals.py
@@ -18,11 +18,12 @@ def _waveform_generated_callback(sender, **kwargs):
     print "Updating model with waveform"
     try:
         uid = kwargs['uid']
+        path = kwargs['uid']
         if uid is not None:
             mix = Mix.objects.get(uid=uid)
             if mix is not None:
                 mix.waveform_generated = True
-                mix.duration = mp3_length(mix.get_absolute_path())
+                mix.duration = mp3_length(path)
                 mix.save(update_fields=["waveform_generated", "duration"])
 
     except ObjectDoesNotExist:
diff --git a/spa/tasks.py b/spa/tasks.py
index 0eceea3..c921c5a 100755
--- a/spa/tasks.py
+++ b/spa/tasks.py
@@ -23,7 +23,7 @@ def create_waveform_task(in_file, uid):
     generate_waveform(in_file, out_file)
     if os.path.isfile(out_file):
         logger.info("Waveform generated successfully")
-        waveform_generated_signal.send(sender=None, uid=uid)
+        waveform_generated_signal.send(sender=None, uid=uid, path=in_file)
         return out_file
     else:
         logger.error("Outfile is missing")