diff --git a/filetracker/client/data_store.py b/filetracker/client/data_store.py
index 6f0c37e..d4bb067 100644
--- a/filetracker/client/data_store.py
+++ b/filetracker/client/data_store.py
@@ -43,7 +43,8 @@ def add_file(self, name, filename, compress_hint=True):
         Works like :meth:`add_stream`, but ``filename`` is the name of
         an existing file in the filesystem.
         """
-        return self.add_stream(name, open(filename, 'rb'))
+        with open(filename, 'rb') as f:
+            return self.add_stream(name, f)
 
     def exists(self, name):
         """Returns ``True`` if the file exists, ``False`` otherwise.