diff --git a/monai/data/thread_buffer.py b/monai/data/thread_buffer.py
index da5f864900..8ea71e3555 100644
--- a/monai/data/thread_buffer.py
+++ b/monai/data/thread_buffer.py
@@ -88,7 +88,7 @@ def __init__(self, dataset: Dataset, num_workers: int = 0, **kwargs):
         super().__init__(dataset, num_workers, **kwargs)
 
         # ThreadBuffer will use the inherited __iter__ instead of the one defined below
-        self.buffer = ThreadBuffer(super())
+        self.buffer = ThreadBuffer(super().__iter__())
 
     def __iter__(self):
         yield from self.buffer