diff --git a/post.php b/post.php
index f5c29f1c..8bdd3660 100644
--- a/post.php
+++ b/post.php
@@ -1158,7 +1158,7 @@ function handle_post()
                 if (!$size = @getimagesize($file['tmp_name'])) {
                     error($config['error']['invalidimg']);
                 }
-                if (!in_array($size[2], array(IMAGETYPE_PNG, IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_BMP))) {
+                if (!in_array($size[2], [IMAGETYPE_PNG, IMAGETYPE_GIF, IMAGETYPE_WEBP, IMAGETYPE_JPEG, IMAGETYPE_BMP])) {
                     error($config['error']['invalidimg']);
                 }
                 if ($size[0] > $config['max_width'] || $size[1] > $config['max_height']) {