diff --git a/src/Configuration/DefaultConfiguration.php b/src/Configuration/DefaultConfiguration.php
index 5ea53b0..eeea44b 100644
--- a/src/Configuration/DefaultConfiguration.php
+++ b/src/Configuration/DefaultConfiguration.php
@@ -23,6 +23,11 @@
  */
 final class DefaultConfiguration extends AbstractConfiguration
 {
+    const SYMFONY_2 = 2;
+    const SYMFONY_3 = 3;
+    const SYMFONY_4 = 4;
+    const SYMFONY_5 = 5;
+
     // variables starting with an underscore are for internal use only
     private $_symfonyEnvironmentEnvVarName; // SYMFONY_ENV or APP_ENV
 
@@ -65,7 +70,7 @@ public function __construct(string $localProjectDir)
     {
         parent::__construct();
         $this->localProjectDir = $localProjectDir;
-        $this->setDefaultConfiguration(Kernel::MAJOR_VERSION, Kernel::MINOR_VERSION);
+        $this->setDefaultConfiguration(Kernel::MAJOR_VERSION);
     }
 
     // this proxy method is needed because the autocompletion breaks
@@ -368,30 +373,50 @@ protected function getReservedServerProperties(): array
         return [Property::bin_dir, Property::config_dir, Property::console_bin, Property::cache_dir, Property::deploy_dir, Property::log_dir, Property::src_dir, Property::templates_dir, Property::web_dir];
     }
 
-    private function setDefaultConfiguration(int $symfonyMajorVersion, $symfonyMinorVersion): void
+    private function setDefaultConfiguration(int $symfonyMajorVersion): self
     {
-        if (2 === $symfonyMajorVersion) {
-            $this->_symfonyEnvironmentEnvVarName = 'SYMFONY_ENV';
+        if(self::SYMFONY_2 > $symfonyMajorVersion || self::SYMFONY_5 < $symfonyMajorVersion)
+        {
+            throw new \InvalidArgumentException("%d is not a supported Symfony version.", $symfonyMajorVersion);
+        }
+
+        $this->setEnvironmentVarName($symfonyMajorVersion);
+
+        if (self::SYMFONY_2 === $symfonyMajorVersion) {
             $this->setDirs('app', 'app/config', 'app/cache', 'app/logs', 'src', 'app/Resources/views', 'web');
             $this->controllersToRemove(['web/app_*.php']);
             $this->sharedFiles = ['app/config/parameters.yml'];
             $this->sharedDirs = ['app/logs'];
             $this->writableDirs = ['app/cache/', 'app/logs/'];
             $this->dumpAsseticAssets = true;
-        } elseif (3 === $symfonyMajorVersion && 4 < $symfonyMinorVersion) {
-            $this->_symfonyEnvironmentEnvVarName = 'SYMFONY_ENV';
+        } elseif (self::SYMFONY_3 === $symfonyMajorVersion) {
             $this->setDirs('bin', 'app/config', 'var/cache', 'var/logs', 'src', 'app/Resources/views', 'web');
             $this->controllersToRemove(['web/app_*.php']);
             $this->sharedFiles = ['app/config/parameters.yml'];
             $this->sharedDirs = ['var/logs'];
             $this->writableDirs = ['var/cache/', 'var/logs/'];
-        } elseif (4 <= $symfonyMajorVersion || (3 === $symfonyMajorVersion && 4 >= $symfonyMinorVersion)) {
-            $this->_symfonyEnvironmentEnvVarName = 'APP_ENV';
+        } elseif (self::SYMFONY_4 <= $symfonyMajorVersion) { // support Symfony 4 or above
             $this->setDirs('bin', 'config', 'var/cache', 'var/log', 'src', 'templates', 'public');
             $this->controllersToRemove([]);
             $this->sharedDirs = ['var/log'];
             $this->writableDirs = ['var/cache/', 'var/log/'];
         }
+
+        return $this;
+    }
+
+    /**
+     * Set the name of the environment variable for Symfony depending on the framework version
+     *
+     * @param int $symfonyMajorVersion
+     */
+    private function setEnvironmentVarName(int $symfonyMajorVersion): void
+    {
+        if ($symfonyMajorVersion > 3) {
+            $this->_symfonyEnvironmentEnvVarName = 'APP_ENV';
+        } else {
+            $this->_symfonyEnvironmentEnvVarName = 'SYMFONY_ENV';
+        }
     }
 
     private function setDirs(string $binDir, string $configDir, string $cacheDir, string $logDir, string $srcDir, string $templatesDir, string $webDir): void