diff --git a/src/Command/MustacheCommand.php b/src/Command/MustacheCommand.php
index e45a818..1b1e533 100644
--- a/src/Command/MustacheCommand.php
+++ b/src/Command/MustacheCommand.php
@@ -54,7 +54,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         // This is a workaround to execute mustache_lint.php file from within a phar.
         $filesystem = new Filesystem();
         $wrapper    = tempnam(sys_get_temp_dir(), 'mustache-linter-wrapper');
-        $filesystem->dumpFile($wrapper, "<?php include '$linter';");
+        $filesystem->dumpFile($wrapper, sprintf('<?php include \'%s\';', $linter));
 
         $code = 0;
         foreach ($files as $file) {
diff --git a/src/Command/ParallelCommand.php b/src/Command/ParallelCommand.php
index 52a3d23..abd861b 100644
--- a/src/Command/ParallelCommand.php
+++ b/src/Command/ParallelCommand.php
@@ -55,7 +55,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
      */
     public function initializeProcesses()
     {
-        $bin    = $command = 'php '.$_SERVER['PHP_SELF'];
+        $bin    = 'php '.$_SERVER['PHP_SELF'];
         $plugin = $this->plugin->directory;
         $moodle = $this->moodle->directory;