diff --git a/beat/web/experiments/models/experiment.py b/beat/web/experiments/models/experiment.py
index db9371fd8801134e297cc49178fd5362a658badd..bda6d9f117bfd5878e51d73c3e7e8bfa23604ceb 100755
--- a/beat/web/experiments/models/experiment.py
+++ b/beat/web/experiments/models/experiment.py
@@ -278,9 +278,9 @@ class Experiment(Shareable):
     #_____ Utilities __________
 
     def natural_key(self):
-
         return (self.author.username,) + \
             self.toolchain.natural_key() + (self.name,)
+    natural_key.dependencies = ['toolchains.toolchain']
 
 
     #_____ Methods __________