diff --git a/pynamodb/models.py b/pynamodb/models.py
index 3ec7952cc..ca768afca 100644
--- a/pynamodb/models.py
+++ b/pynamodb/models.py
@@ -324,7 +324,7 @@ def batch_get(
         :param items: Should be a list of hash keys to retrieve, or a list of
             tuples if range keys are used.
         """
-        items = list(items)
+        items = set(items)
         hash_key_attribute = cls._hash_key_attribute()
         range_key_attribute = cls._range_key_attribute()
         keys_to_get: List[Any] = []
diff --git a/tests/test_model.py b/tests/test_model.py
index 388ef40be..2c9d9a9c1 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -1855,6 +1855,7 @@ def test_batch_get(self):
         Model.batch_get
         """
         self.init_table_meta(SimpleUserModel, SIMPLE_MODEL_TABLE_DATA)
+        self.maxDiff = None
 
         with patch(PATCH_METHOD) as req:
             req.return_value = SIMPLE_BATCH_GET_ITEMS
@@ -1888,21 +1889,22 @@ def test_batch_get(self):
             item_keys = ['hash-{}'.format(x) for x in range(10)]
             for item in SimpleUserModel.batch_get(item_keys, attributes_to_get=['numbers']):
                 self.assertIsNotNone(item)
+            req.call_args[0][1]['RequestItems']['SimpleModel']['Keys'].sort(key=json.dumps)
             params = {
                 'ReturnConsumedCapacity': 'TOTAL',
                 'RequestItems': {
                     'SimpleModel': {
                         'Keys': [
-                            {'user_name': {'S': 'hash-9'}},
-                            {'user_name': {'S': 'hash-8'}},
-                            {'user_name': {'S': 'hash-7'}},
-                            {'user_name': {'S': 'hash-6'}},
-                            {'user_name': {'S': 'hash-5'}},
-                            {'user_name': {'S': 'hash-4'}},
-                            {'user_name': {'S': 'hash-3'}},
-                            {'user_name': {'S': 'hash-2'}},
+                            {'user_name': {'S': 'hash-0'}},
                             {'user_name': {'S': 'hash-1'}},
-                            {'user_name': {'S': 'hash-0'}}
+                            {'user_name': {'S': 'hash-2'}},
+                            {'user_name': {'S': 'hash-3'}},
+                            {'user_name': {'S': 'hash-4'}},
+                            {'user_name': {'S': 'hash-5'}},
+                            {'user_name': {'S': 'hash-6'}},
+                            {'user_name': {'S': 'hash-7'}},
+                            {'user_name': {'S': 'hash-8'}},
+                            {'user_name': {'S': 'hash-9'}}
                         ],
                         'ProjectionExpression': '#0',
                         'ExpressionAttributeNames': {
@@ -1918,21 +1920,22 @@ def test_batch_get(self):
             item_keys = ['hash-{}'.format(x) for x in range(10)]
             for item in SimpleUserModel.batch_get(item_keys, consistent_read=True):
                 self.assertIsNotNone(item)
+            req.call_args[0][1]['RequestItems']['SimpleModel']['Keys'].sort(key=json.dumps)
             params = {
                 'ReturnConsumedCapacity': 'TOTAL',
                 'RequestItems': {
                     'SimpleModel': {
                         'Keys': [
-                            {'user_name': {'S': 'hash-9'}},
-                            {'user_name': {'S': 'hash-8'}},
-                            {'user_name': {'S': 'hash-7'}},
-                            {'user_name': {'S': 'hash-6'}},
-                            {'user_name': {'S': 'hash-5'}},
-                            {'user_name': {'S': 'hash-4'}},
-                            {'user_name': {'S': 'hash-3'}},
-                            {'user_name': {'S': 'hash-2'}},
+                            {'user_name': {'S': 'hash-0'}},
                             {'user_name': {'S': 'hash-1'}},
-                            {'user_name': {'S': 'hash-0'}}
+                            {'user_name': {'S': 'hash-2'}},
+                            {'user_name': {'S': 'hash-3'}},
+                            {'user_name': {'S': 'hash-4'}},
+                            {'user_name': {'S': 'hash-5'}},
+                            {'user_name': {'S': 'hash-6'}},
+                            {'user_name': {'S': 'hash-7'}},
+                            {'user_name': {'S': 'hash-8'}},
+                            {'user_name': {'S': 'hash-9'}}
                         ],
                         'ConsistentRead': True
                     }