diff --git a/fimfarchive/fetchers/fimfarchive.py b/fimfarchive/fetchers/fimfarchive.py
index bd7464e..dc926cd 100644
--- a/fimfarchive/fetchers/fimfarchive.py
+++ b/fimfarchive/fetchers/fimfarchive.py
@@ -141,7 +141,7 @@ class MemoryIndex(Index):
         return len(self.data)
 
     def close(self):
-        self.data.close()
+        self.data.clear()
 
 
 class FimfarchiveFetcher(Fetcher):