diff --git a/dist/index.js b/dist/index.js
index e39e65d..67f5d4e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -36267,7 +36267,7 @@ async function main() {
     const retries = parseInt(core.getInput('retries'));
     const exemptStatusCodes = parseNumberArray(core.getInput('retry-exempt-status-codes'));
     const [retryOpts, requestOpts] = getRetryOptions(retries, exemptStatusCodes, utils.defaults);
-    const baseUserAgent = userAgent || 'actions/github-script';
+    const baseUserAgent = userAgent === '' ? '' : userAgent || 'actions/github-script';
     const finalUserAgent = getUserAgentWithOrchestrationId(baseUserAgent);
     const opts = {
         log: debug ? console : undefined,
diff --git a/src/main.ts b/src/main.ts
index 782aa2a..fa80835 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -39,7 +39,8 @@ async function main(): Promise<void> {
     defaultGitHubOptions
   )
 
-  const baseUserAgent = userAgent || 'actions/github-script'
+  const baseUserAgent =
+    userAgent === '' ? '' : userAgent || 'actions/github-script'
   const finalUserAgent = getUserAgentWithOrchestrationId(baseUserAgent)
 
   const opts: Options = {