diff --git a/api/endpoints/sites.php b/api/endpoints/sites.php
index b724e0f..6c29e98 100644
--- a/api/endpoints/sites.php
+++ b/api/endpoints/sites.php
@@ -60,7 +60,8 @@ function fileSet(string $file, string $constant, string $value): bool {
         "define('" . $constant . "', '" . $safe . "'$1)",
         $content
     );
-    if ($new === null || $new === $content) return false;
+    if ($new === null) return false;   // regex error
+    if ($new === $content) return true;    // already correct value
     return file_put_contents($file, $new) !== false;
 }