diff --git a/python/sglang/srt/arg_groups/deepseek_v4_hook.py b/python/sglang/srt/arg_groups/deepseek_v4_hook.py
index 0359d2a4c..8bf9800f8 100644
--- a/python/sglang/srt/arg_groups/deepseek_v4_hook.py
+++ b/python/sglang/srt/arg_groups/deepseek_v4_hook.py
@@ -204,10 +204,10 @@ def validate_deepseek_v4_cp(server_args: ServerArgs) -> None:
     assert (
         cfg.tp_size <= 8
     ), "Context parallel only supports single machine (tp_size <= 8). Cross-machine CP has precision issues."
-    if cfg.moe_a2a_backend not in ("none", "deepep", "megamoe"):
+    supported_a2a_backends = ("none", "deepep", "megamoe", "mori")
+    if cfg.moe_a2a_backend not in supported_a2a_backends:
         raise ValueError(
-            "DeepSeekV4 CP supports moe_a2a_backend in "
-            "('none', 'deepep', 'megamoe'), "
+            f"DeepSeekV4 CP supports moe_a2a_backend in {supported_a2a_backends}, "
             f"got {cfg.moe_a2a_backend!r}."
         )
     logger.warning(
diff --git a/python/sglang/srt/models/deepseek_v4.py b/python/sglang/srt/models/deepseek_v4.py
index 8052e150d..831ad0eb3 100644
--- a/python/sglang/srt/models/deepseek_v4.py
+++ b/python/sglang/srt/models/deepseek_v4.py
@@ -2304,10 +2304,13 @@ class DeepseekV4DecoderLayer(nn.Module):
             if moe_a2a_backend.is_none():
                 hidden_states = dsa_cp_gather_hidden_states(hidden_states)
             else:
-                assert moe_a2a_backend.is_deepep() or moe_a2a_backend.is_megamoe(), (
-                    "CP requires DeepEP or megaMoE "
-                    "(moe_a2a_backend == deepep or megamoe). "
-                    f"Got {moe_a2a_backend.value}."
+                assert (
+                    moe_a2a_backend.is_deepep()
+                    or moe_a2a_backend.is_megamoe()
+                    or moe_a2a_backend.is_mori()
+                ), (
+                    "CP requires moe_a2a_backend in ('deepep', 'megamoe', 'mori'), "
+                    f"got {moe_a2a_backend.value!r}."
                 )
         elif _use_tp_moe_gather:
             hidden_states, local_hidden_states = (