diff --git a/wp-includes/rewrite.php b/wp-includes/rewrite.php
index acf8711db6..de9ff8906f 100644
--- a/wp-includes/rewrite.php
+++ b/wp-includes/rewrite.php
@@ -1914,7 +1914,7 @@ class WP_Rewrite {
 
 		$this->use_trailing_slashes = ( '/' == substr($this->permalink_structure, -1, 1) );
 
-		$this->use_verbose_page_rules = !! preg_match( "#^/%(postname|category|tag|author)%#", $this->permalink_structure );
+		$this->use_verbose_page_rules = (bool) preg_match( "#^/%(postname|category|tag|author)%#", $this->permalink_structure );
 	}
 
 	/**