diff --git a/bin/build b/bin/build
index 5d43883..639bc6f 100644
--- a/bin/build
+++ b/bin/build
@@ -37,13 +37,26 @@ if (1 == ini_get('phar.readonly')) {
 // create phar
 $p = new Phar($output);
 
+// start buffering. Mandatory to modify stub.
+$p->startBuffering();
+
+// pointing main file which requires all classes
+$defaultStub = $p->createDefaultStub('index.php', '/index.php');
+
 // creating our library using whole directory
 $p->buildFromDirectory($input);
 
-// pointing main file which requires all classes
-$p->setDefaultStub('index.php', '/index.php');
+// Create a custom stub to add the shebang
+$stub = "#!/usr/bin/env php\n" . $defaultStub;
+
+// Add the stub
+$p->setStub($stub);
+
+$p->stopBuffering();
 
 unset($p);
 rename($output, $finalOutput);
 
+chmod($finalOutput, 0755);
+
 echo "$output successfully created";
\ No newline at end of file