diff --git a/iati_datastore/iatilib/codelists/enum.py b/iati_datastore/iatilib/codelists/enum.py
index de3f5ff..c770df0 100644
--- a/iati_datastore/iatilib/codelists/enum.py
+++ b/iati_datastore/iatilib/codelists/enum.py
@@ -13,6 +13,9 @@ def __init__(self, cls_, name, value, description):
         self.value = value
         self.description = description
 
+    def __hash__(self): 
+        return hash(self.value)
+
     def __reduce__(self):
         """Allow unpickling to return the symbol
         linked to the DeclEnum class."""