diff --git a/beat/web/algorithms/models.py b/beat/web/algorithms/models.py
index 2b7d0969af58f2ce21f34e855621887534572ab4..3b74c9df06aa739e0b85b3c610da80fc81fc62c9 100755
--- a/beat/web/algorithms/models.py
+++ b/beat/web/algorithms/models.py
@@ -316,7 +316,7 @@ class Algorithm(Code):
     def all_needed_dataformats(self):
         result = self.all_referenced_dataformats()
 
-        for dataformat in list(result):
+        for dataformat in result:
             result.extend(dataformat.all_needed_dataformats())
 
         return list(set(result))