diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index f2b1bc5996..83287a8606 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -2833,11 +2833,8 @@ class wpdb {
 		// Allow (select...) union [...] style queries. Use the first query's table name.
 		$query = ltrim( $query, "\r\n\t (" );
 
-		/*
-		 * Strip everything between parentheses except nested selects and use only 1,000
-		 * chars of the query.
-		 */
-		$query = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', substr( $query, 0, 1000 ) );
+		// Strip everything between parentheses except nested selects.
+		$query = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', $query );
 
 		// Quickly match most common queries.
 		if ( preg_match( '/^\s*(?:'