diff --git a/test/registered/attention/test_mamba_unittest.py b/test/registered/attention/test_mamba_unittest.py
index 8c6869e37..0a0f45fb8 100644
--- a/test/registered/attention/test_mamba_unittest.py
+++ b/test/registered/attention/test_mamba_unittest.py
@@ -11,6 +11,7 @@ from sglang.srt.mem_cache.mamba_radix_cache import MambaRadixCache
 from sglang.srt.mem_cache.memory_pool import HybridLinearKVPool, HybridReqToTokenPool
 from sglang.srt.mem_cache.radix_cache import RadixKey
 from sglang.srt.sampling.sampling_params import SamplingParams
+from sglang.srt.server_args import ServerArgs, set_global_server_args_for_scheduler
 from sglang.test.ci.ci_register import register_cuda_ci
 
 register_cuda_ci(est_time=9, suite="stage-b-test-small-1-gpu")
@@ -130,6 +131,9 @@ class TestMamba(unittest.TestCase):
         assert req_to_token_pool.mamba_pool.available_size() == mamba_cache_size - 1
 
     def test_mamba_radix_cache_1(self):
+        set_global_server_args_for_scheduler(
+            ServerArgs(model_path="dummy", page_size=1)
+        )
         # kv cache
         size = 128
         dtype = torch.bfloat16