diff --git a/compile.php b/compile.php
index 56e003a9..b3ca074d 100755
--- a/compile.php
+++ b/compile.php
@@ -145,7 +145,7 @@ function php_shrink($input) {
 		$short_variables[$key] = short_identifier($number, $chars); // could use also numbers and \x7f-\xff
 	}
 	
-	$set = array_flip(preg_split('//', '!"#$&\'()*+,-./:;<=>?@[\]^`{|}'));
+	$set = array_flip(preg_split('//', '!"#$%&\'()*+,-./:;<=>?@[\]^`{|}'));
 	$space = '';
 	$output = '';
 	$in_echo = false;