diff --git a/inc/config.php b/inc/config.php
index d5cfc6d0..abc271d9 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -556,6 +556,11 @@
     // Requires $config['strip_combining_chars'] = true;
     $config['max_combining_chars'] = 0;
 
+    // Maximum OP body length.
+    $config['max_body_op'] = 1800;
+    // Minimum OP body length.
+    $config['min_body_op'] = 0;
+
     // Maximum post body length.
     $config['max_body'] = 1800;
     // Minimum post body length.
diff --git a/post.php b/post.php
index 20da003b..d1a7c75b 100644
--- a/post.php
+++ b/post.php
@@ -1231,11 +1231,19 @@ function handle_post()
         if (mb_strlen($post['subject']) > 100) {
             error(sprintf($config['error']['toolong'], 'subject'));
         }
-        if (!$mod && mb_strlen($post['body']) > $config['max_body']) {
-            error($config['error']['toolong_body']);
-        }
-        if (!$mod && mb_strlen($post['body']) > 0 && (mb_strlen($post['body']) < $config['min_body'])) {
-            error($config['error']['tooshort_body']);
+        if (!$mod) {
+            $min_body = $post['op'] ? $config['min_body_op'] : $config['min_body'];
+            $max_body = $post['op'] ? $config['max_body_op'] : $config['max_body'];
+
+            $body_mb_len = mb_strlen($post['body']);
+
+            if ($body_mb_len > 0 && $body_mb_len < $min_body) {
+                error($config['error']['tooshort_body']);
+            }
+
+            if ($body_mb_len > $max_body) {
+                error($config['error']['toolong_body']);
+            }
         }
         if (mb_strlen($post['password']) > 20) {
             error(sprintf($config['error']['toolong'], 'password'));