diff --git a/python/sglang/srt/server.py b/python/sglang/srt/server.py
index ae886796c59..4f06f76300b 100644
--- a/python/sglang/srt/server.py
+++ b/python/sglang/srt/server.py
@@ -360,6 +360,7 @@ def _set_envs_and_config(server_args: ServerArgs):
     os.environ["NCCL_CUMEM_ENABLE"] = "0"
     os.environ["NCCL_NVLS_ENABLE"] = "0"
     os.environ["TORCH_NCCL_AVOID_RECORD_STREAMS"] = "1"
+    os.environ["CUDA_DEVICE_MAX_CONNECTIONS"] = "1"
 
     # Set ulimit
     set_ulimit()