diff --git a/build/scripts/phar-version.php b/build/scripts/phar-version.php
index 64babb124c9..1a91016553e 100755
--- a/build/scripts/phar-version.php
+++ b/build/scripts/phar-version.php
@@ -8,8 +8,8 @@
 \file_put_contents(
     __DIR__ . '/../tmp/phar/phpunit/Runner/Version.php',
     \str_replace(
-        'private static $pharVersion;',
-        'private static $pharVersion = "' . $argv[1] . '";',
+        'private static $pharVersion = \'\';',
+        'private static $pharVersion = \'' . $argv[1] . '\';',
         \file_get_contents(__DIR__ . '/../tmp/phar/phpunit/Runner/Version.php')
     ),
     \LOCK_EX