diff --git a/litestar/middleware/response_cache.py b/litestar/middleware/response_cache.py
index 8d63d94587..fb9fe71462 100644
--- a/litestar/middleware/response_cache.py
+++ b/litestar/middleware/response_cache.py
@@ -49,7 +49,7 @@ async def wrapped_send(message: Message) -> None:
                 elif value_or_default(connection_state.do_cache, False):
                     messages.append(message)
 
-                if messages and message["type"] == HTTP_RESPONSE_BODY and not message.get('more_body')
+                if messages and message["type"] == HTTP_RESPONSE_BODY and not message.get('more_body'):
                     key = (route_handler.cache_key_builder or self.config.key_builder)(Request(scope))
                     store = self.config.get_store_from_app(scope["app"])
                     await store.set(key, encode_msgpack(messages), expires_in=expires_in)