diff --git a/providers/amazon/src/airflow/providers/amazon/aws/sensors/s3.py b/providers/amazon/src/airflow/providers/amazon/aws/sensors/s3.py
index 1bea70ae25544..8a34812eca6a4 100644
--- a/providers/amazon/src/airflow/providers/amazon/aws/sensors/s3.py
+++ b/providers/amazon/src/airflow/providers/amazon/aws/sensors/s3.py
@@ -107,7 +107,7 @@ def __init__(
         self.verify = verify
         self.deferrable = deferrable
         self.use_regex = use_regex
-        self.metadata_keys = metadata_keys if metadata_keys else ["Size"]
+        self.metadata_keys = metadata_keys if metadata_keys else ["Size", "Key"]
 
     def _check_key(self, key, context: Context):
         bucket_name, key = self.hook.get_s3_bucket_key(self.bucket_name, key, "bucket_name", "bucket_key")
@@ -116,7 +116,8 @@ def _check_key(self, key, context: Context):
         """
         Set variable `files` which contains a list of dict which contains attributes defined by the user
         Format: [{
-            'Size': int
+            'Size': int,
+            'Key': str,
         }]
         """
         if self.wildcard_match:
diff --git a/providers/amazon/tests/unit/amazon/aws/sensors/test_s3.py b/providers/amazon/tests/unit/amazon/aws/sensors/test_s3.py
index b9f8fb284bcd0..4ada09d092303 100644
--- a/providers/amazon/tests/unit/amazon/aws/sensors/test_s3.py
+++ b/providers/amazon/tests/unit/amazon/aws/sensors/test_s3.py
@@ -320,11 +320,19 @@ def test_fail_execute_complete(self):
         with pytest.raises(AirflowException, match=message):
             op.execute_complete(context={}, event={"status": "error", "message": message})
 
+    @pytest.mark.parametrize(
+        "metadata_keys, expected",
+        [
+            (["Size", "Key"], True),
+            (["Content"], False),
+            (None, True),
+        ],
+    )
     @mock_aws
-    def test_custom_metadata_default_return_vals(self):
+    def test_custom_metadata_default_return_vals(self, metadata_keys, expected):
         def check_fn(files: list) -> bool:
             for f in files:
-                if "Size" not in f:
+                if "Size" not in f or "Key" not in f:
                     return False
             return True
 
@@ -335,31 +343,14 @@ def check_fn(files: list) -> bool:
             key="test-key",
             string_data="test-body",
         )
-
-        op = S3KeySensor(
-            task_id="test-metadata",
-            bucket_key="test-key",
-            bucket_name="test-bucket",
-            metadata_keys=["Size"],
-            check_fn=check_fn,
-        )
-        assert op.poke(None) is True
         op = S3KeySensor(
             task_id="test-metadata",
             bucket_key="test-key",
             bucket_name="test-bucket",
-            metadata_keys=["Content"],
+            metadata_keys=metadata_keys,
             check_fn=check_fn,
         )
-        assert op.poke(None) is False
-
-        op = S3KeySensor(
-            task_id="test-metadata",
-            bucket_key="test-key",
-            bucket_name="test-bucket",
-            check_fn=check_fn,
-        )
-        assert op.poke(None) is True
+        assert op.poke(None) is expected
 
     @mock_aws
     def test_custom_metadata_default_custom_vals(self):
@@ -391,7 +382,7 @@ def test_custom_metadata_all_attributes(self):
         def check_fn(files: list) -> bool:
             hook = S3Hook()
             metadata_keys = set(hook.head_object(bucket_name="test-bucket", key="test-key").keys())
-            test_data_keys = set(files[0].keys())
+            test_data_keys = set(files[0].keys()) - {"Key"}
 
             return test_data_keys == metadata_keys