diff --git a/pipelines/build.sh b/pipelines/build.sh
index 3411e54aba1319d314260235bb0c1c12a7c6e2c8..ce3338ec324b0d57e1dddae9d7c3806dc1d37d27 100644
--- a/pipelines/build.sh
+++ b/pipelines/build.sh
@@ -22,7 +22,9 @@ echo "===================== show package info ====================="
 pip show $project
 
 echo "===================== download code style tests ====================="
-curl -O https://csst-tb.bao.ac.cn/code/csst-l1/csst_proto/-/raw/main/pipelines/test_codestyle.py
+if [ "$project" != "csst_proto" ]; then
+  curl -O https://csst-tb.bao.ac.cn/code/csst-l1/csst_proto/-/raw/main/pipelines/test_codestyle.py
+fi
 coverage run -m pytest
 
 echo "===================== make coverage ====================="