diff --git a/sqlalchemy_utils/generic.py b/sqlalchemy_utils/generic.py
index 5e0a9dce..294c2c73 100644
--- a/sqlalchemy_utils/generic.py
+++ b/sqlalchemy_utils/generic.py
@@ -41,6 +41,8 @@ def get(self, state, dict_, passive=attributes.PASSIVE_OFF):
             # sqlalchemy 1.3
             target = session.query(target_class).get(id)
 
+        # Cache result for after session expires
+        dict_[self.key] = target
         # Return found (or not found) target.
         return target