diff --git a/config/func.inc.php b/config/func.inc.php
index 06434d2c5..47e6678ce 100644
--- a/config/func.inc.php
+++ b/config/func.inc.php
@@ -1200,7 +1200,7 @@ function removeSrcHack($match)
 				continue;
 			}
 
-			$val = preg_replace('/&#(?:x([a-fA-F0-9]+)|0*(\d+));/e', 'chr("\\1"?0x00\\1:\\2+0)', $m[3][$idx] . $m[4][$idx]);
+			$val = preg_replace_callback('/&#(?:x([a-fA-F0-9]+)|0*(\d+));/', function($n) {return chr($n[1] ? ('0x00' . $n[1]) : ($n[2] + 0)); }, $m[3][$idx] . $m[4][$idx]);
 			$val = preg_replace('/^\s+|[\t\n\r]+/', '', $val);
 
 			if(preg_match('/^[a-z]+script:/i', $val))