diff --git a/index.php b/index.php
index b86f1d92..5a47a66f 100755
--- a/index.php
+++ b/index.php
@@ -10,8 +10,13 @@
 
 namespace Rawilum;
 
+/**
+ * Define the application's minimum supported PHP version.
+ */
+define('RAWILUM_MINIMUM_PHP', '7.1.3');
+
 // Check PHP Version
-version_compare($ver = PHP_VERSION, $req = '7.1.3', '<') and exit(sprintf('You are running PHP %s, but Rawilum needs at least <strong>PHP %s</strong> to run.', $ver, $req));
+version_compare($ver = PHP_VERSION, $req = RAWILUM_MINIMUM_PHP, '<') and exit(sprintf('You are running PHP %s, but Rawilum needs at least <strong>PHP %s</strong> to run.', $ver, $req));
 
 // Ensure vendor libraries exist and Register The Auto Loader
 !is_file($autoload = __DIR__ . '/vendor/autoload.php') and exit("Please run: <i>composer install</i>");