diff --git a/src/wp-includes/pluggable.php b/src/wp-includes/pluggable.php
index ffe2a07395..0779010dce 100644
--- a/src/wp-includes/pluggable.php
+++ b/src/wp-includes/pluggable.php
@@ -1218,7 +1218,7 @@ function wp_sanitize_redirect($location) {
 			|   \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences   11110xxx 10xxxxxx * 3
 			|   [\xF1-\xF3][\x80-\xBF]{3}
 			|   \xF4[\x80-\x8F][\x80-\xBF]{2}
-		){1,50}                              # ...one or more times
+		){1,40}                              # ...one or more times
 		)/x';
 	$location = preg_replace_callback( $regex, '_wp_sanitize_utf8_in_redirect', $location );
 	$location = preg_replace('|[^a-z0-9-~+_.?#=&;,/:%!*\[\]()]|i', '', $location);
diff --git a/src/wp-includes/wp-db.php b/src/wp-includes/wp-db.php
index 91b21b7599..e749f517c4 100644
--- a/src/wp-includes/wp-db.php
+++ b/src/wp-includes/wp-db.php
@@ -2654,7 +2654,7 @@ class wpdb {
 					';
 				}
 
-				$regex .= '){1,50}                          # ...one or more times
+				$regex .= '){1,40}                          # ...one or more times
 					)
 					| .                                  # anything else
 					/x';