diff --git a/etc/inc/system.inc b/etc/inc/system.inc
index 0ebf5a9bcf..6e66b439a3 100644
--- a/etc/inc/system.inc
+++ b/etc/inc/system.inc
@@ -591,7 +591,7 @@ function system_generate_lighty_config($filename,
 
 	if($captive_portal == true)  {
 		$captiveportal = ",\"mod_rewrite\"";
-		$captive_portal_rewrite = "url.rewrite-once = ( \"(.*.[hH][tT][mM][lL]|.*.[hH][tT][mM]|.*.[Gg][iI][fF]|.*.[Pp][nN][Gg]|.*.[Jj][Pp][Gg])\" => \"$1\", \"(.*)\" => \"/index.php?redirurl=$1\" )";
+		$captive_portal_rewrite = "url.rewrite-once = ( \"(.*captiveportal.*)\" => \"$1\", \"(.*)\" => \"/index.php?redirurl=$1\" )";
 	}
 
 	if($port <> "")