diff --git a/python/sglang/srt/server.py b/python/sglang/srt/server.py
index bd1da2392..027550bd1 100644
--- a/python/sglang/srt/server.py
+++ b/python/sglang/srt/server.py
@@ -425,6 +425,9 @@ class Runtime:
             random_seed=random_seed,
             log_level=log_level,
         )
+        import torch
+        torch.multiprocessing.set_start_method("spawn", force=True)
+
         self.url = self.server_args.url()
         self.generate_url = (
             f"http://{self.server_args.host}:{self.server_args.port}/generate"