diff --git a/src/setup-python.ts b/src/setup-python.ts
index 132c42f1..104d93f2 100644
--- a/src/setup-python.ts
+++ b/src/setup-python.ts
@@ -164,8 +164,12 @@ async function run() {
       if (pypiUrl) {
         const pypiUsername = core.getInput('pypi-username');
         const pypiPassword = core.getInput('pypi-password');
-        core.setSecret(pypiUsername);
-        core.setSecret(pypiPassword);
+        if (pypiUsername && pypiUsername.trim()) {
+          core.setSecret(pypiUsername);
+        }
+        if (pypiPassword && pypiPassword.trim()) {
+          core.setSecret(pypiPassword);
+        }
         await configurePipRepository(pypiUrl, pypiUsername, pypiPassword);
       }
       const pipInstall = core.getInput('pip-install');