diff --git a/dist/setup.js b/dist/setup.js
index d296262..25c2bc8 100644
--- a/dist/setup.js
+++ b/dist/setup.js
@@ -33,7 +33,9 @@ export default async ({ daggerVersion, engineVersion, wasm, pipeline, args, work
     ]);
     await exec("sudo", ["mv", "bin/dagger", "/usr/local/bin"]);
     const version = await verifyFluentCI("fluentci");
-    action.exportVariable("FLUENTCI_ENGINE_VERSION", engineVersion.startsWith("v") ? engineVersion : `v${engineVersion}`);
+    if (engineVersion) {
+        action.exportVariable("FLUENTCI_ENGINE_VERSION", engineVersion.startsWith("v") ? engineVersion : `v${engineVersion}`);
+    }
     if (pipeline) {
         if (wasm) {
             if (!args.length) {
diff --git a/src/setup.ts b/src/setup.ts
index d1a0c99..0ae78ec 100644
--- a/src/setup.ts
+++ b/src/setup.ts
@@ -50,10 +50,12 @@ export default async ({
   await exec("sudo", ["mv", "bin/dagger", "/usr/local/bin"]);
   const version = await verifyFluentCI("fluentci");
 
-  action.exportVariable(
-    "FLUENTCI_ENGINE_VERSION",
-    engineVersion.startsWith("v") ? engineVersion : `v${engineVersion}`
-  );
+  if (engineVersion) {
+    action.exportVariable(
+      "FLUENTCI_ENGINE_VERSION",
+      engineVersion.startsWith("v") ? engineVersion : `v${engineVersion}`
+    );
+  }
 
   if (pipeline) {
     if (wasm) {