diff --git a/aiocache/factory.py b/aiocache/factory.py
index e1ebac33..9517ee5c 100644
--- a/aiocache/factory.py
+++ b/aiocache/factory.py
@@ -151,6 +151,7 @@ def add(self, alias: str, config: Dict[str, object]) -> None:
         :param config: Mapping containing the cache configuration
         """
         self._config[alias] = config
+        self._caches.pop(alias, None)
 
     def get(self, alias: str) -> object:
         """