diff --git a/zuul_registry/filesystem.py b/zuul_registry/filesystem.py
index 6cdb102..cedc76f 100644
--- a/zuul_registry/filesystem.py
+++ b/zuul_registry/filesystem.py
@@ -52,6 +52,8 @@ class FilesystemDriver(storageutils.StorageDriver):
             else:
                 for chunk in data:
                     f.write(chunk)
+            f.flush()
+            os.fsync(f.fileno())
 
     def get_object(self, path):
         path = os.path.join(self.root, path)
@@ -117,6 +119,8 @@ class FilesystemDriver(storageutils.StorageDriver):
                         if not d:
                             break
                         outf.write(d)
+            outf.flush()
+            os.fsync(outf.fileno())
         for chunk in chunks:
             chunk_path = os.path.join(self.root, chunk['path'])
             os.unlink(chunk_path)