diff --git a/plugins/system/sef/sef.php b/plugins/system/sef/sef.php
index 3fa5a85457ebb..4a0c6d0ba75e5 100644
--- a/plugins/system/sef/sef.php
+++ b/plugins/system/sef/sef.php
@@ -90,7 +90,7 @@ public function onAfterRender()
 		{
 			if (strpos($buffer, $attribute) !== false)
 			{
-				$regex  = '#\s+' . $attribute . '"(?!/|' . $protocols . '|\#|\')([^"]+)"#m';
+				$regex  = '#\s+' . $attribute . '"(?!/|' . $protocols . '|\#|\')([^"]*)"#m';
 				$buffer = preg_replace($regex, ' ' . $attribute . '"' . $base . '$1"', $buffer);
 				$this->checkBuffer($buffer);
 			}