diff --git a/Editor.php b/Editor.php
index 39f1814..b89e26b 100644
--- a/Editor.php
+++ b/Editor.php
@@ -2578,7 +2578,7 @@ private function _pkey_separator()
 	{
 		$str = implode(',', $this->_pkey);
 
-		return hash('crc32', $str);
+		return '_' . hash('crc32', $str) . '_';
 	}
 
 	private function _read_table()