diff --git a/tibi_hardlinks/cache.py b/tibi_hardlinks/cache.py
index bf34060..51d2042 100644
--- a/tibi_hardlinks/cache.py
+++ b/tibi_hardlinks/cache.py
@@ -13,7 +13,7 @@ class Cache:
         atexit.register(self.store)
 
     def read(self, key):
-        if self.store is None:
+        if self._store is None:
             self.load()
         try:
             return self._store[key]
@@ -21,7 +21,7 @@ class Cache:
             return None
 
     def write(self, key, data):
-        if self.store is None:
+        if self._store is None:
             self.load()
         self._store[key] = data