diff --git a/tests/generation/test_utils.py b/tests/generation/test_utils.py
index 7b7226ca3e62e9..3af5cbebf7024b 100644
--- a/tests/generation/test_utils.py
+++ b/tests/generation/test_utils.py
@@ -1846,9 +1846,9 @@ def test_new_cache_format(self, num_beams, do_sample):
             if config.is_encoder_decoder:
                 cache_cls = EncoderDecoderCache
                 past_key_values = cache_cls(DynamicCache(), DynamicCache())
-            elif getattr(self.config, "sliding_window", None) is not None:
+            elif getattr(config, "sliding_window", None) is not None:
                 cache_cls = DynamicSlidingWindowCache
-                past_key_values = cache_cls(self.config.sliding_window)
+                past_key_values = cache_cls(config.sliding_window)
             else:
                 cache_cls = DynamicCache
                 past_key_values = cache_cls()