diff --git a/spa/ajax.py b/spa/ajax.py
index 900a4f6..b9fd8d3 100755
--- a/spa/ajax.py
+++ b/spa/ajax.py
@@ -250,7 +250,7 @@ def upload(request):
             #Form hasn't been posted yet
             pass
 
-        create_waveform_task.delay(in_file=os.path.join(file_storage.base_location, cache_file), mix_uid=uid)
+        create_waveform_task.delay(in_file=os.path.join(file_storage.base_location, cache_file), uid=uid)
 
         file_dict = {
             'size': in_file.size,