diff --git a/inc/config.php b/inc/config.php
index 75475a9a..cd5896fc 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -361,7 +361,7 @@
 	$config['markup'][] = array("/'''(.+?)'''/", "<strong>\$1</strong>");
 	$config['markup'][] = array("/''(.+?)''/", "<em>\$1</em>");
 	$config['markup'][] = array("/\*\*(.+?)\*\*/", "<span class=\"spoiler\">\$1</span>");
-	$config['markup'][] = array("/^\s*==(.+?)==\s*$/m", "<span class=\"heading\">\$1</span>");
+	$config['markup'][] = array("/^[ |\t]*==(.+?)==[ |\t]*$/m", "<span class=\"heading\">\$1</span>");
 	
 	// Highlight PHP code wrapped in <code> tags (PHP 5.3.0+)
 	// $config['markup'][] = array(