diff --git a/python/sglang/srt/server_args.py b/python/sglang/srt/server_args.py
index e0f0752a3..92fbcb575 100644
--- a/python/sglang/srt/server_args.py
+++ b/python/sglang/srt/server_args.py
@@ -4651,11 +4651,7 @@ class ServerArgs:
             self.attention_backend = "triton"
 
         if (
-            (
-                self.attention_backend == "fa4"
-                or self.decode_attention_backend == "fa4"
-                or self.prefill_attention_backend == "fa4"
-            )
+            self.prefill_attention_backend == "fa4"
             and not self.use_mla_backend()
             and is_sm100_supported()
         ):
diff --git a/test/registered/unit/server_args/test_server_args.py b/test/registered/unit/server_args/test_server_args.py
index b375870f7..be2215977 100644
--- a/test/registered/unit/server_args/test_server_args.py
+++ b/test/registered/unit/server_args/test_server_args.py
@@ -256,48 +256,6 @@ class TestHiSparseDsaBackendPolicy(unittest.TestCase):
             server_args._validate_hisparse_kv_cache_dtype()
 
 
-class TestFa4PageSizeAutoForce(CustomTestCase):
-    """FA4 requires page_size 128 for non-MLA models on SM100. The auto-force
-    must trigger for `--attention-backend fa4` (combined) too, not only for the
-    explicit `--prefill-attention-backend fa4` path."""
-
-    def _make_args(self, attention_backend, prefill=None, decode=None, page_size=1):
-        args = ServerArgs(model_path="dummy")
-        args.attention_backend = attention_backend
-        args.prefill_attention_backend = prefill
-        args.decode_attention_backend = decode
-        args.page_size = page_size
-        # Short-circuit get_model_config(): the fa4 page_size branch only needs
-        # use_mla_backend() (mocked) and is_sm100_supported() (mocked), not a
-        # real model_config. Pre-set the attribute so get_model_config returns
-        # early without touching ModelConfig.from_server_args.
-        args.model_config = MagicMock()
-        args.model_config.hf_config.dual_chunk_attention_config = None
-        return args
-
-    @patch("sglang.srt.server_args.is_sm100_supported", return_value=True)
-    @patch("sglang.srt.server_args.ServerArgs.use_mla_backend", return_value=False)
-    def test_combined_attention_backend_fa4_forces_page_size_128(
-        self, _mock_mla, _mock_sm100
-    ):
-        # `--attention-backend fa4` (combined): prefill/decode fields stay None.
-        args = self._make_args(attention_backend="fa4")
-
-        args._handle_attention_backend_compatibility()
-
-        self.assertEqual(args.page_size, 128)
-
-    @patch("sglang.srt.server_args.is_sm100_supported", return_value=True)
-    @patch("sglang.srt.server_args.ServerArgs.use_mla_backend", return_value=False)
-    def test_explicit_prefill_fa4_forces_page_size_128(self, _mock_mla, _mock_sm100):
-        # `--prefill-attention-backend fa4`: the previously-covered path.
-        args = self._make_args(attention_backend=None, prefill="fa4", page_size=1)
-
-        args._handle_attention_backend_compatibility()
-
-        self.assertEqual(args.page_size, 128)
-
-
 class TestContextParallelServerArgs(CustomTestCase):
     def setUp(self):
         self.parser = server_args_module.argparse.ArgumentParser()