diff --git a/ci/utils/build.ps1 b/ci/utils/build.ps1
index bda0cb9..cd16315 100644
--- a/ci/utils/build.ps1
+++ b/ci/utils/build.ps1
@@ -32,4 +32,7 @@ $python_versions.Split(" ") | ForEach {
         }
     }
 }
-pytest -vvx
+If($action -ne "tools") {
+    # no sdist on Windows
+    pytest -vvx
+}
diff --git a/ci/utils/build.sh b/ci/utils/build.sh
index fd91838..d44202f 100755
--- a/ci/utils/build.sh
+++ b/ci/utils/build.sh
@@ -30,6 +30,7 @@ do
     fi
 done
 if [[ $1 != tools ]]; then
+    # build sdist on Linux
     python -m build --no-isolation --sdist --outdir dist
     pytest -vvx
 fi