diff --git a/post.php b/post.php
index 5081845f..729170a7 100644
--- a/post.php
+++ b/post.php
@@ -541,7 +541,7 @@ if (isset($_POST['delete'])) {
 		"\n<tinyboard flag alt>" . $flag_alt . "</tinyboard>";
 	}
 
-	if ($config['allowed_tags'] && $_POST['op'] && isset($_POST['tag']) && isset($config['allowed_tags'][$_POST['tag']])) {
+	if ($config['allowed_tags'] && $post['op'] && isset($_POST['tag']) && isset($config['allowed_tags'][$_POST['tag']])) {
 		$post['body'] .= "\n<tinyboard tag>" . $_POST['tag'] . "</tinyboard>";
 	}