diff --git a/peewee.py b/peewee.py
index b8be051c0..69fe2dd8d 100644
--- a/peewee.py
+++ b/peewee.py
@@ -1245,6 +1245,9 @@ def __init__(self, node, alias):
         super(Alias, self).__init__(node)
         self._alias = alias
 
+    def __hash__(self):
+        return hash(self._alias)
+
     def alias(self, alias=None):
         if alias is None:
             return self.node