diff --git a/monai/data/thread_buffer.py b/monai/data/thread_buffer.py
index 8ea71e3555..2901335bd5 100644
--- a/monai/data/thread_buffer.py
+++ b/monai/data/thread_buffer.py
@@ -87,8 +87,6 @@ class ThreadDataLoader(DataLoader):
     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().__iter__())
-
     def __iter__(self):
-        yield from self.buffer
+        buffer = ThreadBuffer(super().__iter__())
+        yield from buffer
diff --git a/tests/test_thread_buffer.py b/tests/test_thread_buffer.py
index 1b3ebb910d..507b6909be 100644
--- a/tests/test_thread_buffer.py
+++ b/tests/test_thread_buffer.py
@@ -48,6 +48,8 @@ def test_dataloader(self):
         for d in dataloader:
             self.assertEqual(d["image"][0], "spleen_19.nii.gz")
             self.assertEqual(d["image"][1], "spleen_31.nii.gz")
+
+        for d in dataloader:
             self.assertEqual(d["label"][0], "spleen_label_19.nii.gz")
             self.assertEqual(d["label"][1], "spleen_label_31.nii.gz")