diff --git a/tryton/common/selection.py b/tryton/common/selection.py
index 5544640fba..ba345c41b1 100644
--- a/tryton/common/selection.py
+++ b/tryton/common/selection.py
@@ -145,7 +145,7 @@ def freeze_value(value):
     if isinstance(value, dict):
         return tuple(sorted((k, freeze_value(v))
                 for k, v in value.items()))
-    elif isinstance(value, (list, set)):
+    elif isinstance(value, (list, set, tuple)):
         return tuple(freeze_value(v) for v in value)
     else:
         return value