diff --git a/inc/config.php b/inc/config.php
index 77c3ed57..f058c491 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -318,6 +318,7 @@
 		'hash',
 		'board',
 		'thread',
+		'active-page',
 		'mod',
 		'name',
 		'email',
diff --git a/post.php b/post.php
index 1f3a2b97..a00b0e2b 100644
--- a/post.php
+++ b/post.php
@@ -713,7 +713,15 @@ if (isset($_POST['delete'])) {
 		}
 
 		if (!$post['mod']) {
-			$post['antispam_hash'] = checkSpam(array($board['uri'], isset($post['thread']) ? $post['thread'] : ($config['try_smarter'] && isset($_POST['page']) ? 0 - (int)$_POST['page'] : null)));
+
+			if (isset($_POST['active-page']) && $_POST['active-page'] === 'index') {
+				$page = isset($_POST['page']) ? (int)$_POST['page'] : 0;
+				$extra_salt = $config['try_smarter'] ? -$page : 0;
+			} else {
+				$extra_salt = $post['thread'];
+			}
+
+			$post['antispam_hash'] = checkSpam(array($board['uri'], $extra_salt));
 			if ($post['antispam_hash'] === true)
 				error($config['error']['spam']);
 		}
diff --git a/templates/post_form.html b/templates/post_form.html
index 038395fa..f1192c08 100644
--- a/templates/post_form.html
+++ b/templates/post_form.html
@@ -1,6 +1,11 @@
 <form name="post" onsubmit="return doPost(this);" enctype="multipart/form-data" action="{{ config.post_url }}" method="post">
 {{ antibot.html() }}
-{% if id %}<input type="hidden" name="thread" value="{{ id }}">{% endif %}
+{% if id %}
+	<input type="hidden" name="thread" value="{{ id }}">
+	<input type="hidden" name="active-page" value="thread">
+{% else %}
+	<input type="hidden" name="active-page" value="index">
+{% endif %}
 {{ antibot.html() }}
 <input type="hidden" name="board" value="{{ board.uri }}">
 {{ antibot.html() }}