diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 69d9362ce2..948f6083b4 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -2589,7 +2589,7 @@ class wpdb {
 					';
 				}
 
-				$regex .= '){1,50}                          # ...one or more times
+				$regex .= '){1,40}                          # ...one or more times
 					)
 					| .                                  # anything else
 					/x';