diff --git a/inmemorystorage/storage.py b/inmemorystorage/storage.py
index 94a9846..8ca35bc 100644
--- a/inmemorystorage/storage.py
+++ b/inmemorystorage/storage.py
@@ -211,4 +211,7 @@ def created_time(self, name):
         return file.created_at
 
     def __eq__(self, other):
-        return self.filesystem == other.filesystem and self.base_url == other.base_url
+        return (
+            isinstance(other, InMemoryStorage)
+            and self.filesystem == other.filesystem and self.base_url == other.base_url
+        )