diff --git a/citext/__init__.py b/citext/__init__.py
index b9c4bd9..5126aa6 100644
--- a/citext/__init__.py
+++ b/citext/__init__.py
@@ -10,6 +10,8 @@
 
 
 class CIText(types.Concatenable, types.UserDefinedType):
+    cache_ok = True
+
     # This is copied from the `literal_processor` of sqlalchemy's own `String`
     # type.
     def literal_processor(self, dialect):