diff --git a/lib/setup-terraform.js b/lib/setup-terraform.js
index 87e7575..f3269a6 100644
--- a/lib/setup-terraform.js
+++ b/lib/setup-terraform.js
@@ -81,8 +81,13 @@ async function installWrapper (pathToCLI) {
   try {
     source = path.resolve([__dirname, '..', 'wrapper', 'dist', 'index.js'].join(path.sep));
     target = [pathToCLI, 'terraform'].join(path.sep);
-    core.debug(`Copying ${source} to ${target}.`);
-    await io.cp(source, target);
+
+    core.debug(`Reading wrapper from ${source} and updating shebang.`);
+    const wrapperContent = (await fs.readFile(source, 'utf8')).split('\n');
+    wrapperContent[0] = `#!${process.argv[0]}`;
+
+    core.debug(`Writing updated wrapper to ${target}.`);
+    await fs.writeFile(target, wrapperContent.join('\n'));
   } catch (e) {
     core.error(`Unable to copy ${source} to ${target}.`);
     throw e;