diff --git a/index.php b/index.php
index 03765dd..71ed918 100644
--- a/index.php
+++ b/index.php
@@ -30,23 +30,18 @@ define('WHITELIST_FILE', __DIR__ . '/whitelist.txt');
 
 /*
   Create a file named 'DEBUG' for enabling debug mode.
-  For further security, you may put whitelisted IP addresses
-  in the 'DEBUG' file, one IP per line. Empty file allows anyone(!).
-  Debugging allows displaying PHP error messages and bypasses the cache: this can allow a malicious
-  client to retrieve data about your server and hammer a provider throught your rss-bridge instance.
+  For further security, you may put whitelisted IP addresses in the file,
+  one IP per line. Empty file allows anyone(!).
+  Debugging allows displaying PHP error messages and bypasses the cache: this
+  can allow a malicious client to retrieve data about your server and hammer
+  a provider throught your rss-bridge instance.
 */
 if(file_exists('DEBUG')) {
-	$debug_enabled = true;
 	$debug_whitelist = trim(file_get_contents('DEBUG'));
-	if(strlen($debug_whitelist) > 0) {
-		$debug_enabled = false;
-		foreach(explode("\n", $debug_whitelist) as $allowed_ip) {
-			if(trim($allowed_ip) === $_SERVER['REMOTE_ADDR']) {
-				$debug_enabled = true;
-				break;
-			}
-		}
-	}
+
+	$debug_enabled = empty($debug_whitelist)
+	|| in_array($_SERVER['REMOTE_ADDR'], explode("\n", $debug_whitelist));
+
 	if($debug_enabled) {
 		ini_set('display_errors', '1');
 		error_reporting(E_ALL);