diff --git a/mongita/engines/disk_engine.py b/mongita/engines/disk_engine.py
index 0f78d76..8b1cfa3 100644
--- a/mongita/engines/disk_engine.py
+++ b/mongita/engines/disk_engine.py
@@ -319,7 +319,7 @@ def create_path(self, collection):
             os.makedirs(full_loc)
 
     def close(self):
-        self._cache = self._cache = Cache(engine = self)
+        self._cache = Cache(engine = self)
         self._metadata = {}
         self._file_attrs = {}
         for fh in self._collection_fhs.values():