diff --git a/m3u8/model.py b/m3u8/model.py
index bb09be5c..f06fc3fc 100644
--- a/m3u8/model.py
+++ b/m3u8/model.py
@@ -361,7 +361,7 @@ def __init__(self, uri, base_uri, program_date_time=None, duration=None,
         self.byterange = byterange
         self.program_date_time = program_date_time
         self.discontinuity = discontinuity
-        self.key = Key(base_uri=base_uri,**key) if key else None
+        self.key = Key(base_uri=base_uri,**key) if key and 'uri' in key else None
 
 
     def dumps(self, last_segment):