diff --git a/sgl-router/setup.py b/sgl-router/setup.py
index 730a91ceb..38cd64011 100644
--- a/sgl-router/setup.py
+++ b/sgl-router/setup.py
@@ -1,12 +1,13 @@
 import os
 
 from setuptools import setup
-from setuptools_rust import Binding, RustExtension
 
 no_rust = os.environ.get("SGLANG_ROUTER_BUILD_NO_RUST") == "1"
 
 rust_extensions = []
 if not no_rust:
+    from setuptools_rust import Binding, RustExtension
+
     rust_extensions.append(
         RustExtension(
             target="sglang_router_rs",